diff --git a/ChangeLog b/ChangeLog
index adbe06a1..7a0eb2e9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2008-02-19  Nicolas François  <nicolas.francois@centraliens.net>
+
+	* src/groupmod.c: Add missing 'p' to the getopt_long's optstring.
+
 2008-02-19  Nicolas François  <nicolas.francois@centraliens.net>
 
 	* src/groupadd.c: Add missing 'p' to the getopt_long's optstring.
diff --git a/src/groupmod.c b/src/groupmod.c
index 6bcadddd..4255e858 100644
--- a/src/groupmod.c
+++ b/src/groupmod.c
@@ -369,7 +369,7 @@ static void process_flags (int argc, char **argv)
 			{NULL, 0, NULL, '\0'}
 		};
 		while ((c =
-			getopt_long (argc, argv, "g:hn:o",
+			getopt_long (argc, argv, "g:hn:op:",
 				     long_options, &option_index)) != -1) {
 			switch (c) {
 			case 'g':