diff --git a/src/groupmod.c b/src/groupmod.c
index 828c7c0b..7802e5b1 100644
--- a/src/groupmod.c
+++ b/src/groupmod.c
@@ -15,6 +15,7 @@
 #include <fcntl.h>
 #include <getopt.h>
 #include <grp.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <sys/types.h>
 #ifdef ACCT_TOOLS_SETUID
@@ -574,8 +575,7 @@ static void prepare_failure_reports (void)
 
 	(void) snprintf (info_group.action,
 	                 512 - strlen (info_group.audit_msg),
-	                 "group %s/%lu",
-	                 group_name, (unsigned long int) group_id);
+	                 "group %s/%ju", group_name, (uintmax_t) group_id);
 #ifdef	SHADOWGRP
 	(void) snprintf (info_gshadow.action,
 	                 512 - strlen (info_group.audit_msg),
@@ -583,8 +583,7 @@ static void prepare_failure_reports (void)
 #endif
 	(void) snprintf (info_passwd.action,
 	                 512 - strlen (info_group.audit_msg),
-	                 "group %s/%lu",
-	                 group_name, (unsigned long int) group_id);
+	                 "group %s/%ju", group_name, (uintmax_t) group_id);
 
 	if (nflg) {
 		strncat (info_group.action, ", new name: ",
@@ -618,13 +617,13 @@ static void prepare_failure_reports (void)
 		         511 - strlen (info_group.audit_msg));
 		(void) snprintf (info_group.action+strlen (info_group.action),
 		                 512 - strlen (info_group.audit_msg),
-		                 "%lu", (unsigned long int) group_newid);
+		                 "%ju", (uintmax_t) group_newid);
 
 		strncat (info_passwd.action, ", new gid: ",
 		         511 - strlen (info_passwd.audit_msg));
 		(void) snprintf (info_passwd.action+strlen (info_passwd.action),
 		                 512 - strlen (info_passwd.audit_msg),
-		                 "%lu", (unsigned long int) group_newid);
+		                 "%ju", (uintmax_t) group_newid);
 	}
 	info_group.audit_msg[511]   = '\0';
 #ifdef	SHADOWGRP