diff --git a/ms/emx/config.h b/ms/emx/config.h
index ef10ca1..6d036df 100644
--- a/ms/emx/config.h
+++ b/ms/emx/config.h
@@ -16,4 +16,6 @@
    is used by other (old-fashioned) programs that need re_comp.  */
 #define _REGEX_RE_COMP
 
+#define same_file(s,t) (-1)
+
 #define STAT_BLOCKSIZE(s) 65536