diff --git a/azurerm/resource_arm_api_management_test.go b/azurerm/resource_arm_api_management_test.go
index 9bbabd3e739e..1e83b1615689 100644
--- a/azurerm/resource_arm_api_management_test.go
+++ b/azurerm/resource_arm_api_management_test.go
@@ -306,7 +306,7 @@ resource "azurerm_api_management" "test" {
 
     portal {
       host_name            = "portal.terraform.io"
-      certificate          = "${filebase64("testdata/api_management_portal_test.pfx"))}"
+      certificate          = "${filebase64("testdata/api_management_portal_test.pfx")}"
       certificate_password = "terraform"
     }
   }
diff --git a/azurerm/resource_arm_application_gateway_test.go b/azurerm/resource_arm_application_gateway_test.go
index 60ede482b143..5f7c568db193 100644
--- a/azurerm/resource_arm_application_gateway_test.go
+++ b/azurerm/resource_arm_application_gateway_test.go
@@ -1313,7 +1313,7 @@ resource "azurerm_application_gateway" "test" {
 
   ssl_certificate {
     name     = "${local.ssl_certificate_name}"
-    data     = "${file("testdata/application_gateway_test.pfx")}"
+    data     = "${filebase64("testdata/application_gateway_test.pfx")}"
     password = "terraform"
   }
 }
@@ -1392,7 +1392,7 @@ resource "azurerm_application_gateway" "test" {
 
   ssl_certificate {
     name     = "${local.ssl_certificate_name}"
-    data     = "${file("testdata/application_gateway_test_2.pfx")}"
+    data     = "${filebase64("testdata/application_gateway_test_2.pfx")}"
     password = "hello-world"
   }
 }