diff --git a/grammar/src/types.grm b/grammar/src/types.grm
index 163ea9314e0..ae299a85c24 100644
--- a/grammar/src/types.grm
+++ b/grammar/src/types.grm
@@ -34,10 +34,10 @@ userType
   ;
 
 simpleUserType
-  : SimpleName ("<" (optionalProjection type | "*"){","} ">")?
+  : SimpleName ("<" (projection? type | "*"){","} ">")?
   ;
 
-optionalProjection
+projection
   : varianceAnnotation
   ;