diff --git a/mozilla/modules/libreg/src/reg.c b/mozilla/modules/libreg/src/reg.c
index afda7599f35..83b12cb50f4 100644
--- a/mozilla/modules/libreg/src/reg.c
+++ b/mozilla/modules/libreg/src/reg.c
@@ -354,7 +354,9 @@ static REGERR nr_OpenFile(char *path, FILEHANDLE *fh)
 #ifdef XP_MAC
         case opWrErr:
 #else
+#ifndef XP_OS2_VACPP
         case EROFS:     /* read-only file system */
+#endif
         case EACCES:    /* file in use or read-only file*/
 #endif
             /* try read only */