diff --git a/configure.in b/configure.in
index 59e663f994..3ad4680206 100644
--- a/configure.in
+++ b/configure.in
@@ -2928,7 +2928,7 @@ libraries returned by 'pkg-config gtk+-2.0 --libs' or 'gtk-config
         esac
 
         if test "$WXGTK20" = 1; then
-            save_CXXFLAGS="$CFLAGS"
+            save_CFLAGS="$CFLAGS"
             save_LIBS="$LIBS"
             CFLAGS="$wx_cv_cflags_gtk $CFLAGS"
             LIBS="$LIBS $wx_cv_libs_gtk"