diff --git a/github/orgs_rules_test.go b/github/orgs_rules_test.go
index d45469f27e..13d4c76da0 100644
--- a/github/orgs_rules_test.go
+++ b/github/orgs_rules_test.go
@@ -555,12 +555,14 @@ func TestOrganizationsService_CreateOrganizationRuleset_RepoProperty(t *testing.
 				Include: []RulesetRepositoryPropertyTargetParameters{
 					{
 						Name:   "testIncludeProp",
+						Source: "custom",
 						Values: []string{"true"},
 					},
 				},
 				Exclude: []RulesetRepositoryPropertyTargetParameters{
 					{
 						Name:   "testExcludeProp",
+						Source: "custom",
 						Values: []string{"false"},
 					},
 				},
@@ -647,12 +649,14 @@ func TestOrganizationsService_CreateOrganizationRuleset_RepoProperty(t *testing.
 				Include: []RulesetRepositoryPropertyTargetParameters{
 					{
 						Name:   "testIncludeProp",
+						Source: "custom",
 						Values: []string{"true"},
 					},
 				},
 				Exclude: []RulesetRepositoryPropertyTargetParameters{
 					{
 						Name:   "testExcludeProp",
+						Source: "custom",
 						Values: []string{"false"},
 					},
 				},
@@ -1206,6 +1210,7 @@ func TestOrganizationsService_GetOrganizationRulesetWithRepoPropCondition(t *tes
 				Include: []RulesetRepositoryPropertyTargetParameters{
 					{
 						Name:   "testIncludeProp",
+						Source: "custom",
 						Values: []string{"true"},
 					},
 				},
@@ -1397,6 +1402,7 @@ func TestOrganizationsService_UpdateOrganizationRulesetWithRepoProp(t *testing.T
 				Include: []RulesetRepositoryPropertyTargetParameters{
 					{
 						Name:   "testIncludeProp",
+						Source: "custom",
 						Values: []string{"true"},
 					},
 				},
@@ -1428,6 +1434,7 @@ func TestOrganizationsService_UpdateOrganizationRulesetWithRepoProp(t *testing.T
 				Include: []RulesetRepositoryPropertyTargetParameters{
 					{
 						Name:   "testIncludeProp",
+						Source: "custom",
 						Values: []string{"true"},
 					},
 				},
diff --git a/github/repos_rules.go b/github/repos_rules.go
index 6d394164ce..3c6e8f01c9 100644
--- a/github/repos_rules.go
+++ b/github/repos_rules.go
@@ -52,6 +52,7 @@ type RulesetRepositoryIDsConditionParameters struct {
 type RulesetRepositoryPropertyTargetParameters struct {
 	Name   string   `json:"name"`
 	Values []string `json:"property_values"`
+	Source string   `json:"source"`
 }
 
 // RulesetRepositoryPropertyConditionParameters represents the conditions object for repository_property.