diff --git a/emul/fnmatch.h b/emul/fnmatch.h
index f8308b38a..85777ab89 100644
--- a/emul/fnmatch.h
+++ b/emul/fnmatch.h
@@ -42,4 +42,6 @@
 #define	FNM_PATHNAME	0x02	/* Slash must be matched by slash. */
 #define	FNM_PERIOD	0x04	/* Period must be matched by period. */
 
+int fnmatch	__P((const char *, const char *, int));
+
 #endif /* !_FNMATCH_H_ */