diff --git a/rc/bin/Bfn b/rc/bin/Bfn
index 636aee524..907a414ee 100755
--- a/rc/bin/Bfn
+++ b/rc/bin/Bfn
@@ -1,9 +1,11 @@
 #!/bin/rc
+rfork e
 if(! ~ $#* 1){
 	echo usage: $0 fn >[2=1]
 	exit usage
 }
-res=`{grep -n '^'$1'\(' *.c | sed -n 's/^([^:]*:[^:]*).*$/\1/gp' }
+if(~ $#srcpath 0) srcpath=.
+res=`{grep -n '^'$1'\(' $srcpath/*.c /dev/null | sed -n 's/^([^:]*:[^:]*).*$/\1/gp' }
 ifs='
 '
 for(i in $res)