diff --git a/vlib/builtin/cfns.v b/vlib/builtin/cfns.v
index 38f3e9eed1..9dec4340ab 100644
--- a/vlib/builtin/cfns.v
+++ b/vlib/builtin/cfns.v
@@ -19,7 +19,7 @@ fn backtrace(a voidptr, b int) int
 fn backtrace_symbols_fd(voidptr, int, int)
 
 // <libproc.h>
-//fn proc_pidpath(int, voidptr, int) int
+fn proc_pidpath(int, voidptr, int) int
 
 
 
diff --git a/vlib/os/os.v b/vlib/os/os.v
index 89c61301f2..f4d7f076eb 100644
--- a/vlib/os/os.v
+++ b/vlib/os/os.v
@@ -698,8 +698,6 @@ pub fn executable() string {
 		return string_from_wide2(result, len)
 	}
 	$if mac {
-		return os.args[0]
-		/*
 		mut result := malloc(MAX_PATH)
 		pid := C.getpid()
 		ret := proc_pidpath (pid, result, MAX_PATH)
@@ -708,7 +706,6 @@ pub fn executable() string {
 			return '.'
 		}
 		return string(result)
-		*/
 	}
 	$if freebsd {
 		mut result := malloc(MAX_PATH)