diff --git a/misc.c b/misc.c
index 9f443ea..a4bb3db 100644
--- a/misc.c
+++ b/misc.c
@@ -58,7 +58,7 @@ _PROTOTYPE(static void closePipes,(void));
 _PROTOTYPE(static int dolstat,(char *path, char *buf, int len));
 _PROTOTYPE(static int dostat,(char *path, char *buf, int len));
 _PROTOTYPE(static int doreadlink,(char *path, char *buf, int len));
-_PROTOTYPE(static int doinchild,(int (*fn)(), char *fp, char *rbuf, int rbln));
+_PROTOTYPE(static int doinchild,(int (*fn)(char *, char *, int), char *fp, char *rbuf, int rbln));
 
 #if	defined(HASINTSIGNAL)
 _PROTOTYPE(static int handleint,(int sig));
@@ -234,7 +234,7 @@ compdev(a1, a2)
 
 static int
 doinchild(fn, fp, rbuf, rbln)
-	int (*fn)();			/* function to perform */
+	int (*fn)(char *, char *, int);			/* function to perform */
 	char *fp;			/* function parameter */
 	char *rbuf;			/* response buffer */
 	int rbln;			/* response buffer length */
@@ -296,7 +296,7 @@ doinchild(fn, fp, rbuf, rbln)
 			     */
 			    struct stat _;
 		    } r;
-		    int (*r_fn)();
+		    int (*r_fn)(char *, char *, int);
 		/*
 		 * Close sufficient open file descriptors except Pipes[0] and
 		 * Pipes[3].