diff --git a/src/pwunconv.c b/src/pwunconv.c
index c392c349..fb6d2af8 100644
--- a/src/pwunconv.c
+++ b/src/pwunconv.c
@@ -47,6 +47,7 @@
 /*
  * Global variables
  */
+static char *Prog;
 static bool shadow_locked = false;
 static bool passwd_locked = false;
 
@@ -79,7 +80,7 @@ int main (int argc, char **argv)
 	struct passwd pwent;
 	const struct spwd *spwd;
 
-	char *Prog = argv[0];
+	Prog = Basename (argv[0]);
 
 	(void) setlocale (LC_ALL, "");
 	(void) bindtextdomain (PACKAGE, LOCALEDIR);