diff --git a/ChangeLog b/ChangeLog
index fbb37653..872f24d3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2010-03-30  Nicolas François  <nicolas.francois@centraliens.net>
+
+	* src/su.c: shell's name must be -su when a su fakes a login.
+
 2010-03-30  Nicolas François  <nicolas.francois@centraliens.net>
 
 	* NEWS, configure.in, libmisc/copydir.c, man/useradd.8.xml,
diff --git a/src/su.c b/src/su.c
index 837e76c3..a844edc8 100644
--- a/src/su.c
+++ b/src/su.c
@@ -1021,7 +1021,7 @@ int main (int argc, char **argv)
 		 * Use the shell and create an argv
 		 * with the rest of the command line included.
 		 */
-		argv[-1] = shellstr;
+		argv[-1] = cp;
 #ifndef USE_PAM
 		execve_shell (shellstr, &argv[-1], environ);
 		err = errno;