diff --git a/panda/src/gobj/shader.cxx b/panda/src/gobj/shader.cxx
index eca73217b6..fc4ac4e7ad 100644
--- a/panda/src/gobj/shader.cxx
+++ b/panda/src/gobj/shader.cxx
@@ -1653,11 +1653,11 @@ compile_parameter(ShaderArgInfo &p, int *arg_dim) {
       (!cp_errchk_parameter_uniform(p))) {
     return false;
   }
-  bool k_prefix  = false;
+  //bool k_prefix  = false;
 
   // solve backward compatibility issue
   if (pieces[0] == "k") {
-    k_prefix = true;
+    //k_prefix = true;
     basename = basename.substr(2);
   }