diff --git a/src/mesa/main/getstring.c b/src/mesa/main/getstring.c
index 3d5ae0b694b..86db39463c1 100644
--- a/src/mesa/main/getstring.c
+++ b/src/mesa/main/getstring.c
@@ -70,7 +70,9 @@ shading_language_version(struct gl_context *ctx)
          return (const GLubyte *) "4.60";
       default:
          _mesa_problem(ctx,
-                       "Invalid GLSL version in shading_language_version()");
+                       "Invalid GLSL version (%d) in shading_language_version()");
+         _mesa_problem(ctx,
+                       "Context API GL %s", ctx->API == API_OPENGL_CORE ? "Core" : "Compat");
          return (const GLubyte *) 0;
       }
       break;