diff --git a/google/resource_compute_global_forwarding_rule.go b/google/resource_compute_global_forwarding_rule.go
index 5cc650c9..73fd11a7 100644
--- a/google/resource_compute_global_forwarding_rule.go
+++ b/google/resource_compute_global_forwarding_rule.go
@@ -60,7 +60,6 @@ func resourceComputeGlobalForwardingRule() *schema.Resource {
 				Type:     schema.TypeMap,
 				Optional: true,
 				Elem:     &schema.Schema{Type: schema.TypeString},
-				Set:      schema.HashString,
 			},
 
 			"label_fingerprint": {
diff --git a/google/resource_compute_instance.go b/google/resource_compute_instance.go
index fc13e51f..5611cbb7 100644
--- a/google/resource_compute_instance.go
+++ b/google/resource_compute_instance.go
@@ -395,7 +395,6 @@ func resourceComputeInstance() *schema.Resource {
 				Type:     schema.TypeMap,
 				Optional: true,
 				Elem:     &schema.Schema{Type: schema.TypeString},
-				Set:      schema.HashString,
 			},
 
 			"metadata": {
diff --git a/google/resource_google_project.go b/google/resource_google_project.go
index c977cd35..d55a42dd 100644
--- a/google/resource_google_project.go
+++ b/google/resource_google_project.go
@@ -86,7 +86,6 @@ func resourceGoogleProject() *schema.Resource {
 				Type:     schema.TypeMap,
 				Optional: true,
 				Elem:     &schema.Schema{Type: schema.TypeString},
-				Set:      schema.HashString,
 			},
 			"app_engine": {
 				Type:     schema.TypeList,
diff --git a/google/resource_sql_database_instance.go b/google/resource_sql_database_instance.go
index a89ed6ac..d85beb18 100644
--- a/google/resource_sql_database_instance.go
+++ b/google/resource_sql_database_instance.go
@@ -247,7 +247,6 @@ func resourceSqlDatabaseInstance() *schema.Resource {
 							Type:     schema.TypeMap,
 							Optional: true,
 							Elem:     &schema.Schema{Type: schema.TypeString},
-							Set:      schema.HashString,
 						},
 					},
 				},