diff --git a/builder/azure/arm/authenticate_test.go b/builder/azure/arm/authenticate_test.go
index 37d7b0e1b..12791138c 100644
--- a/builder/azure/arm/authenticate_test.go
+++ b/builder/azure/arm/authenticate_test.go
@@ -8,7 +8,7 @@ import (
 
 // Behavior is the most important thing to assert for ServicePrincipalToken, but
 // that cannot be done in a unit test because it involves network access.  Instead,
-// I assert the expected intertness of this class.
+// I assert the expected inertness of this class.
 func TestNewAuthenticate(t *testing.T) {
 	testSubject := NewAuthenticate(azure.PublicCloud, "clientID", "clientString", "tenantID")
 	spn, err := testSubject.getServicePrincipalToken()