diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c
index abf2c458887..7172e41ab75 100644
--- a/src/mesa/main/shaderapi.c
+++ b/src/mesa/main/shaderapi.c
@@ -1705,7 +1705,7 @@ _mesa_DeleteObjectARB(GLhandleARB obj)
          delete_shader(ctx, obj);
       }
       else {
-         /* error? */
+         _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteObjectARB");
       }
    }
 }