diff --git a/src/OpenGL/compiler/ParseHelper.cpp b/src/OpenGL/compiler/ParseHelper.cpp
index 83f58ce..7cca42c 100644
--- a/src/OpenGL/compiler/ParseHelper.cpp
+++ b/src/OpenGL/compiler/ParseHelper.cpp
@@ -406,6 +406,7 @@
 	case EvqFrontFacing:    message = "can't modify gl_FrontFacing"; break;
 	case EvqPointCoord:     message = "can't modify gl_PointCoord";  break;
 	case EvqInstanceID:     message = "can't modify gl_InstanceID";  break;
+	case EvqVertexID:       message = "can't modify gl_VertexID";    break;
 	default:
 
 		//