diff --git a/examples/sample-app/application-template-dockerbuild.json b/examples/sample-app/application-template-dockerbuild.json
index 08e99b5ca6e1..ca50735409d3 100644
--- a/examples/sample-app/application-template-dockerbuild.json
+++ b/examples/sample-app/application-template-dockerbuild.json
@@ -144,6 +144,9 @@
             "name": "origin-ruby-sample:latest"
           }
         },
+        "postCommit": {
+          "script": "bundle exec rake test"
+        },
         "resources": {}
       },
       "status": {
diff --git a/examples/sample-app/application-template-pullspecbuild.json b/examples/sample-app/application-template-pullspecbuild.json
index de7fc5aeb042..7fa70da4e075 100644
--- a/examples/sample-app/application-template-pullspecbuild.json
+++ b/examples/sample-app/application-template-pullspecbuild.json
@@ -136,6 +136,9 @@
             "name": "origin-ruby-sample:latest"
           }
         },
+        "postCommit": {
+          "script": "bundle exec rake test"
+        },
         "resources": {}
       },
       "status": {
diff --git a/examples/sample-app/application-template-stibuild.json b/examples/sample-app/application-template-stibuild.json
index e8f06e86073f..d82a0047bfbe 100644
--- a/examples/sample-app/application-template-stibuild.json
+++ b/examples/sample-app/application-template-stibuild.json
@@ -146,6 +146,9 @@
             "name": "origin-ruby-sample:latest"
           }
         },
+        "postCommit": {
+          "script": "bundle exec rake test"
+        },
         "resources": {}
       },
       "status": {
diff --git a/pkg/build/api/types.go b/pkg/build/api/types.go
index 56e8394472e4..7b5b21d370f4 100644
--- a/pkg/build/api/types.go
+++ b/pkg/build/api/types.go
@@ -441,7 +441,7 @@ type SourceBuildStrategy struct {
 // The above is a convenient form which is equivalent to:
 //
 // 	BuildPostCommitSpec{
-// 		Command: []string{"/bin/sh", "-c"},
+// 		Command: []string{"/bin/sh", "-ic"},
 // 		Args: []string{"rake test --verbose"},
 // 	}
 //
@@ -486,7 +486,7 @@ type SourceBuildStrategy struct {
 // the fields are specified, the hook is not executed.
 type BuildPostCommitSpec struct {
 	// Command is the command to run. It may not be specified with Script.
-	// This might be needed if the image doesn't have "/bin/sh", or if you
+	// This might be needed if the image doesn't have `/bin/sh`, or if you
 	// do not want to use a shell. In all other cases, using Script might be
 	// more convenient.
 	Command []string
@@ -494,11 +494,16 @@ type BuildPostCommitSpec struct {
 	// Script or the Docker image's default entrypoint. The arguments are
 	// placed immediately after the command to be run.
 	Args []string
-	// Script is a shell script to be run with `/bin/sh -c`. It may not be
+	// Script is a shell script to be run with `/bin/sh -ic`. It may not be
 	// specified with Command. Use Script when a shell script is appropriate
 	// to execute the post build hook, for example for running unit tests
-	// with "rake test". If you need control over the image entrypoint, or
-	// if the image does not have "/bin/sh", use Command and/or Args.
+	// with `rake test`. If you need control over the image entrypoint, or
+	// if the image does not have `/bin/sh`, use Command and/or Args.
+	// The `-i` flag is needed to support CentOS and RHEL images that use
+	// Software Collections (SCL), in order to have the appropriate
+	// collections enabled in the shell. E.g., in the Ruby image, this is
+	// necessary to make `ruby`, `bundle` and other binaries available in
+	// the PATH.
 	Script string
 }
 
diff --git a/pkg/build/api/v1/types.go b/pkg/build/api/v1/types.go
index 408717a3aab2..dd1e90f83b86 100644
--- a/pkg/build/api/v1/types.go
+++ b/pkg/build/api/v1/types.go
@@ -424,7 +424,7 @@ type SourceBuildStrategy struct {
 // The above is a convenient form which is equivalent to:
 //
 // 	BuildPostCommitSpec{
-// 		Command: []string{"/bin/sh", "-c"},
+// 		Command: []string{"/bin/sh", "-ic"},
 // 		Args: []string{"rake test --verbose"},
 // 	}
 //
@@ -469,7 +469,7 @@ type SourceBuildStrategy struct {
 // the fields are specified, the hook is not executed.
 type BuildPostCommitSpec struct {
 	// Command is the command to run. It may not be specified with Script.
-	// This might be needed if the image doesn't have "/bin/sh", or if you
+	// This might be needed if the image doesn't have `/bin/sh`, or if you
 	// do not want to use a shell. In all other cases, using Script might be
 	// more convenient.
 	Command []string `json:"command,omitempty" description:"command to be executed in a container running the build output image replacing the image's entrypoint"`
@@ -477,11 +477,16 @@ type BuildPostCommitSpec struct {
 	// Script or the Docker image's default entrypoint. The arguments are
 	// placed immediately after the command to be run.
 	Args []string `json:"args,omitempty" description:"arguments to command, script or the default image entrypoint"`
-	// Script is a shell script to be run with `/bin/sh -c`. It may not be
+	// Script is a shell script to be run with `/bin/sh -ic`. It may not be
 	// specified with Command. Use Script when a shell script is appropriate
 	// to execute the post build hook, for example for running unit tests
-	// with "rake test". If you need control over the image entrypoint, or
-	// if the image does not have "/bin/sh", use Command and/or Args.
+	// with `rake test`. If you need control over the image entrypoint, or
+	// if the image does not have `/bin/sh`, use Command and/or Args.
+	// The `-i` flag is needed to support CentOS and RHEL images that use
+	// Software Collections (SCL), in order to have the appropriate
+	// collections enabled in the shell. E.g., in the Ruby image, this is
+	// necessary to make `ruby`, `bundle` and other binaries available in
+	// the PATH.
 	Script string `json:"script,omitempty" description:"shell script to be executed in a container running the build output image"`
 }
 
diff --git a/pkg/build/api/v1beta3/types.go b/pkg/build/api/v1beta3/types.go
index cbe960922f3e..54f511f68946 100644
--- a/pkg/build/api/v1beta3/types.go
+++ b/pkg/build/api/v1beta3/types.go
@@ -411,7 +411,7 @@ type SourceBuildStrategy struct {
 // The above is a convenient form which is equivalent to:
 //
 // 	BuildPostCommitSpec{
-// 		Command: []string{"/bin/sh", "-c"},
+// 		Command: []string{"/bin/sh", "-ic"},
 // 		Args: []string{"rake test --verbose"},
 // 	}
 //
@@ -456,7 +456,7 @@ type SourceBuildStrategy struct {
 // the fields are specified, the hook is not executed.
 type BuildPostCommitSpec struct {
 	// Command is the command to run. It may not be specified with Script.
-	// This might be needed if the image doesn't have "/bin/sh", or if you
+	// This might be needed if the image doesn't have `/bin/sh`, or if you
 	// do not want to use a shell. In all other cases, using Script might be
 	// more convenient.
 	Command []string `json:"command,omitempty" description:"command to be executed in a container running the build output image replacing the image's entrypoint"`
@@ -464,11 +464,16 @@ type BuildPostCommitSpec struct {
 	// Script or the Docker image's default entrypoint. The arguments are
 	// placed immediately after the command to be run.
 	Args []string `json:"args,omitempty" description:"arguments to command, script or the default image entrypoint"`
-	// Script is a shell script to be run with `/bin/sh -c`. It may not be
+	// Script is a shell script to be run with `/bin/sh -ic`. It may not be
 	// specified with Command. Use Script when a shell script is appropriate
 	// to execute the post build hook, for example for running unit tests
-	// with "rake test". If you need control over the image entrypoint, or
-	// if the image does not have "/bin/sh", use Command and/or Args.
+	// with `rake test`. If you need control over the image entrypoint, or
+	// if the image does not have `/bin/sh`, use Command and/or Args.
+	// The `-i` flag is needed to support CentOS and RHEL images that use
+	// Software Collections (SCL), in order to have the appropriate
+	// collections enabled in the shell. E.g., in the Ruby image, this is
+	// necessary to make `ruby`, `bundle` and other binaries available in
+	// the PATH.
 	Script string `json:"script,omitempty" description:"shell script to be executed in a container running the build output image"`
 }
 
diff --git a/pkg/build/builder/common.go b/pkg/build/builder/common.go
index 9b079b887dc5..9ccd9360c369 100644
--- a/pkg/build/builder/common.go
+++ b/pkg/build/builder/common.go
@@ -135,7 +135,12 @@ func execPostCommitHook(client DockerClient, postCommitSpec api.BuildPostCommitS
 	glog.V(4).Infof("Post commit hook spec: %+v", postCommitSpec)
 
 	if script != "" {
-		command = []string{"/bin/sh", "-c"}
+		// The `-i` flag is needed to support CentOS and RHEL images
+		// that use Software Collections (SCL), in order to have the
+		// appropriate collections enabled in the shell. E.g., in the
+		// Ruby image, this is necessary to make `ruby`, `bundle` and
+		// other binaries available in the PATH.
+		command = []string{"/bin/sh", "-ic"}
 		args = append([]string{script, command[0]}, args...)
 	}