diff --git a/Fixtures/TestProject/GeneratedProject.xcodeproj/project.pbxproj b/Fixtures/TestProject/GeneratedProject.xcodeproj/project.pbxproj
index 356951782..b5eb094be 100644
--- a/Fixtures/TestProject/GeneratedProject.xcodeproj/project.pbxproj
+++ b/Fixtures/TestProject/GeneratedProject.xcodeproj/project.pbxproj
@@ -196,7 +196,7 @@
 				SBP299349701 /* Sources */,
 				RBP299349701 /* Resources */,
 				HBP299349701 /* Headers */,
-				SSBP30211001 /* Run Script */,
+				SSBP35382101 /* Run Script */,
 			);
 			buildRules = (
 			);
@@ -215,7 +215,8 @@
 				HBP652326301 /* Headers */,
 				FBP652326301 /* Frameworks */,
 				CFBP50493301 /* Copy Files */,
-				SSBP46803701 /* Run Script */,
+				SSBP24648001 /* Run Script */,
+				SSBP19207501 /* Run Script */,
 			);
 			buildRules = (
 			);
@@ -277,7 +278,7 @@
 /* End PBXResourcesBuildPhase section */
 
 /* Begin PBXShellScriptBuildPhase section */
-		SSBP30211001 /* Run Script */ = {
+		SSBP19207501 /* Run Script */ = {
 			isa = PBXShellScriptBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
@@ -291,7 +292,21 @@
 			shellPath = /bin/sh;
 			shellScript = "if which swiftlint >/dev/null; then\n  swiftlint\nelse\n  echo \"warning: SwiftLint not installed, download from https://github.com/realm/SwiftLint\"\nfi\n";
 		};
-		SSBP46803701 /* Run Script */ = {
+		SSBP24648001 /* Run Script */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+			);
+			name = "Strip Unused Architectures from Frameworks";
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 1;
+			shellPath = /bin/sh;
+			shellScript = "################################################################################\n#\n# Copyright 2015 Realm Inc.\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n# http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n#\n################################################################################\n\n# This script strips all non-valid architectures from dynamic libraries in\n# the application's `Frameworks` directory.\n#\n# The following environment variables are required:\n#\n# BUILT_PRODUCTS_DIR\n# FRAMEWORKS_FOLDER_PATH\n# VALID_ARCHS\n# EXPANDED_CODE_SIGN_IDENTITY\n\n\n# Signs a framework with the provided identity\ncode_sign() {\n  # Use the current code_sign_identitiy\n  echo \"Code Signing $1 with Identity ${EXPANDED_CODE_SIGN_IDENTITY_NAME}\"\n  echo \"/usr/bin/codesign --force --sign ${EXPANDED_CODE_SIGN_IDENTITY} --preserve-metadata=identifier,entitlements $1\"\n  /usr/bin/codesign --force --sign ${EXPANDED_CODE_SIGN_IDENTITY} --preserve-metadata=identifier,entitlements \"$1\"\n}\n\n# Set working directory to product’s embedded frameworks\ncd \"${BUILT_PRODUCTS_DIR}/${FRAMEWORKS_FOLDER_PATH}\"\n\nif [ \"$ACTION\" = \"install\" ]; then\n  echo \"Copy .bcsymbolmap files to .xcarchive\"\n  find . -name '*.bcsymbolmap' -type f -exec mv {} \"${CONFIGURATION_BUILD_DIR}\" \;\nelse\n  # Delete *.bcsymbolmap files from framework bundle unless archiving\n  find . -name '*.bcsymbolmap' -type f -exec rm -rf \"{}\" +\;\nfi\n\necho \"Stripping frameworks\"\n\nfor file in $(find . -type f -perm +111); do\n  # Skip non-dynamic libraries\n  if ! [[ \"$(file \"$file\")\" == *\"dynamically linked shared library\"* ]]; then\n    continue\n  fi\n  # Get architectures for current file\n  archs=\"$(lipo -info \"${file}\" | rev | cut -d ':' -f1 | rev)\"\n  stripped=\"\"\n  for arch in $archs; do\n    if ! [[ \"${VALID_ARCHS}\" == *\"$arch\"* ]]; then\n      # Strip non-valid architectures in-place\n      lipo -remove \"$arch\" -output \"$file\" \"$file\" || exit 1\n      stripped=\"$stripped $arch\"\n    fi\n  done\n  if [[ \"$stripped\" != \"\" ]]; then\n    echo \"Stripped $file of architectures:$stripped\"\n    if [ \"${CODE_SIGNING_REQUIRED}\" == \"YES\" ]; then\n      code_sign \"${file}\"\n    fi\n  fi\ndone\n";
+		};
+		SSBP35382101 /* Run Script */ = {
 			isa = PBXShellScriptBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
diff --git a/Fixtures/TestProject/scripts/strip-frameworks.sh b/Fixtures/TestProject/scripts/strip-frameworks.sh
new file mode 100644
index 000000000..c25991a1a
--- /dev/null
+++ b/Fixtures/TestProject/scripts/strip-frameworks.sh
@@ -0,0 +1,72 @@
+################################################################################
+#
+# Copyright 2015 Realm Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+# This script strips all non-valid architectures from dynamic libraries in
+# the application's `Frameworks` directory.
+#
+# The following environment variables are required:
+#
+# BUILT_PRODUCTS_DIR
+# FRAMEWORKS_FOLDER_PATH
+# VALID_ARCHS
+# EXPANDED_CODE_SIGN_IDENTITY
+
+
+# Signs a framework with the provided identity
+code_sign() {
+  # Use the current code_sign_identitiy
+  echo "Code Signing $1 with Identity ${EXPANDED_CODE_SIGN_IDENTITY_NAME}"
+  echo "/usr/bin/codesign --force --sign ${EXPANDED_CODE_SIGN_IDENTITY} --preserve-metadata=identifier,entitlements $1"
+  /usr/bin/codesign --force --sign ${EXPANDED_CODE_SIGN_IDENTITY} --preserve-metadata=identifier,entitlements "$1"
+}
+
+# Set working directory to product’s embedded frameworks
+cd "${BUILT_PRODUCTS_DIR}/${FRAMEWORKS_FOLDER_PATH}"
+
+if [ "$ACTION" = "install" ]; then
+  echo "Copy .bcsymbolmap files to .xcarchive"
+  find . -name '*.bcsymbolmap' -type f -exec mv {} "${CONFIGURATION_BUILD_DIR}" \;
+else
+  # Delete *.bcsymbolmap files from framework bundle unless archiving
+  find . -name '*.bcsymbolmap' -type f -exec rm -rf "{}" +\;
+fi
+
+echo "Stripping frameworks"
+
+for file in $(find . -type f -perm +111); do
+  # Skip non-dynamic libraries
+  if ! [[ "$(file "$file")" == *"dynamically linked shared library"* ]]; then
+    continue
+  fi
+  # Get architectures for current file
+  archs="$(lipo -info "${file}" | rev | cut -d ':' -f1 | rev)"
+  stripped=""
+  for arch in $archs; do
+    if ! [[ "${VALID_ARCHS}" == *"$arch"* ]]; then
+      # Strip non-valid architectures in-place
+      lipo -remove "$arch" -output "$file" "$file" || exit 1
+      stripped="$stripped $arch"
+    fi
+  done
+  if [[ "$stripped" != "" ]]; then
+    echo "Stripped $file of architectures:$stripped"
+    if [ "${CODE_SIGNING_REQUIRED}" == "YES" ]; then
+      code_sign "${file}"
+    fi
+  fi
+done
diff --git a/Fixtures/TestProject/spec.yml b/Fixtures/TestProject/spec.yml
index 0b75848df..4f07755a5 100644
--- a/Fixtures/TestProject/spec.yml
+++ b/Fixtures/TestProject/spec.yml
@@ -13,6 +13,9 @@ targets:
       testTargets:
         - TestProjectTests
     postbuildScripts:
+      - path: scripts/strip-frameworks.sh
+        name: Strip Unused Architectures from Frameworks
+        runOnlyWhenInstalling: true
       - name: Swiftlint
         script: |
           if which swiftlint >/dev/null; then
diff --git a/Sources/XcodeGenKit/PBXProjGenerator.swift b/Sources/XcodeGenKit/PBXProjGenerator.swift
index 33aa136aa..a8fe74297 100644
--- a/Sources/XcodeGenKit/PBXProjGenerator.swift
+++ b/Sources/XcodeGenKit/PBXProjGenerator.swift
@@ -293,13 +293,14 @@ public class PBXProjGenerator {
 
         func getBuildScript(buildScript: BuildScript) throws -> PBXShellScriptBuildPhase {
 
-            let shellScript: String
+            var shellScript: String
             switch buildScript.script {
             case let .path(path):
                 shellScript = try (basePath + path).read()
             case let .script(script):
                 shellScript = script
             }
+            shellScript = shellScript.replacingOccurrences(of: "\"", with: "\\\"") // TODO: remove when xcodeproj escaped values
             let shellScriptPhase = PBXShellScriptBuildPhase(
                 reference: generateUUID(PBXShellScriptBuildPhase.self, String(describing: buildScript.name) + shellScript + target.name),
                 files: [],