diff --git a/dtool/src/interrogate/interfaceMakerPythonNative.cxx b/dtool/src/interrogate/interfaceMakerPythonNative.cxx
index f4e7251bdc..0e8a316bff 100755
--- a/dtool/src/interrogate/interfaceMakerPythonNative.cxx
+++ b/dtool/src/interrogate/interfaceMakerPythonNative.cxx
@@ -161,7 +161,7 @@ RenameSet classRenameDictionary[] = {
 
 ///////////////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////////////
-char * pythonKeywords[] = {
+const char * pythonKeywords[] = {
     "and",
         "del",
         "for",