diff --git a/RenderSystems/GL/src/atifs/include/ps_1_4.h b/RenderSystems/GL/src/atifs/include/ps_1_4.h
index ecbe82b4784..741edcc4e48 100644
--- a/RenderSystems/GL/src/atifs/include/ps_1_4.h
+++ b/RenderSystems/GL/src/atifs/include/ps_1_4.h
@@ -286,7 +286,7 @@ class PS_1_4 : public Compiler2Pass{
 #ifdef _DEBUG
     FILE* fp;
     // full compiler test with output results going to a text file
-    void testCompile(char* testname, char* teststr, SymbolID* testresult,
+    void testCompile(const char* testname, const char* teststr, SymbolID* testresult,
         uint testresultsize, GLuint* MachinInstResults = NULL, uint MachinInstResultsSize = 0);
 #endif // _DEBUG