diff --git a/graphics/opendx/files/patch-src_uipp_dxuilib_EditorWindow.C b/graphics/opendx/files/patch-src_uipp_dxuilib_EditorWindow.C
index b09683034a2e..05b8655af81c 100644
--- a/graphics/opendx/files/patch-src_uipp_dxuilib_EditorWindow.C
+++ b/graphics/opendx/files/patch-src_uipp_dxuilib_EditorWindow.C
@@ -5,7 +5,7 @@
      const char *tmpdir = theDXApplication->getTmpDirectory();
      int tmpdirlen = STRLEN(tmpdir);
 -    if (!tmpdirlen) return FALSE;
-+    if (!tmpdirlen) return (char*) FALSE;
++    if (!tmpdirlen) return NULL;
      if (tmpdir[tmpdirlen-1] == '/') {
  	sprintf(netfilename, "%sdx%d.net", tmpdir, getpid());
  	sprintf(cfgfilename, "%sdx%d.cfg", tmpdir, getpid());