diff --git a/builtin/providers/azurerm/resource_arm_virtual_machine_test.go b/builtin/providers/azurerm/resource_arm_virtual_machine_test.go
index a563bc28f..8e11e9fa2 100644
--- a/builtin/providers/azurerm/resource_arm_virtual_machine_test.go
+++ b/builtin/providers/azurerm/resource_arm_virtual_machine_test.go
@@ -46,7 +46,7 @@ func TestAccAzureRMVirtualMachine_tags(t *testing.T) {
 					resource.TestCheckResourceAttr(
 						"azurerm_virtual_machine.test", "tags.environment", "Production"),
 					resource.TestCheckResourceAttr(
-						"azurerm_virtual_machine.test", "tags.cost_center", "Ops"),
+						"azurerm_virtual_machine.test", "tags.cost-center", "Ops"),
 				),
 			},