diff --git a/google/resource_google_project_services.go b/google/resource_google_project_services.go
index aecf2ab1..206a4f3a 100644
--- a/google/resource_google_project_services.go
+++ b/google/resource_google_project_services.go
@@ -32,8 +32,11 @@ func resourceGoogleProjectServices() *schema.Resource {
 			"services": {
 				Type:     schema.TypeSet,
 				Required: true,
-				Elem:     &schema.Schema{Type: schema.TypeString},
 				Set:      schema.HashString,
+				Elem: &schema.Schema{
+					Type:         schema.TypeString,
+					ValidateFunc: StringNotInSlice(ignoredProjectServices, false),
+				},
 			},
 			"disable_on_destroy": &schema.Schema{
 				Type:     schema.TypeBool,
@@ -44,13 +47,11 @@ func resourceGoogleProjectServices() *schema.Resource {
 	}
 }
 
+var ignoredProjectServices = []string{"dataproc-control.googleapis.com", "source.googleapis.com", "stackdriverprovisioning.googleapis.com"}
+
 // These services can only be enabled as a side-effect of enabling other services,
 // so don't bother storing them in the config or using them for diffing.
-var ignoreProjectServices = map[string]struct{}{
-	"dataproc-control.googleapis.com":        struct{}{},
-	"source.googleapis.com":                  struct{}{},
-	"stackdriverprovisioning.googleapis.com": struct{}{},
-}
+var ignoreProjectServices = golangSetFromStringSlice(ignoredProjectServices)
 
 func resourceGoogleProjectServicesCreate(d *schema.ResourceData, meta interface{}) error {
 	config := meta.(*Config)
diff --git a/google/utils.go b/google/utils.go
index 38c4fbfd..29ce7d00 100644
--- a/google/utils.go
+++ b/google/utils.go
@@ -341,6 +341,15 @@ func convertStringSet(set *schema.Set) []string {
 	return s
 }
 
+func golangSetFromStringSlice(strings []string) map[string]struct{} {
+	set := map[string]struct{}{}
+	for _, v := range strings {
+		set[v] = struct{}{}
+	}
+
+	return set
+}
+
 func mergeSchemas(a, b map[string]*schema.Schema) map[string]*schema.Schema {
 	merged := make(map[string]*schema.Schema)
 
diff --git a/google/validation.go b/google/validation.go
index 6ab10c49..b840b57a 100644
--- a/google/validation.go
+++ b/google/validation.go
@@ -186,3 +186,25 @@ func validateProjectName() schema.SchemaValidateFunc {
 		return
 	}
 }
+
+// StringNotInSlice returns a SchemaValidateFunc which tests if the provided value
+// is of type string and that it matches none of the element in the invalid slice.
+// if ignorecase is true, case is ignored.
+func StringNotInSlice(invalid []string, ignoreCase bool) schema.SchemaValidateFunc {
+	return func(i interface{}, k string) (s []string, es []error) {
+		v, ok := i.(string)
+		if !ok {
+			es = append(es, fmt.Errorf("expected type of %s to be string", k))
+			return
+		}
+
+		for _, str := range invalid {
+			if v == str || (ignoreCase && strings.ToLower(v) == strings.ToLower(str)) {
+				es = append(es, fmt.Errorf("expected %s to not match any of %v, got %s", k, invalid, v))
+				return
+			}
+		}
+
+		return
+	}
+}