diff --git a/src/sysusers/sysusers.c b/src/sysusers/sysusers.c
index 1209a5a8b4..c0af69300a 100644
--- a/src/sysusers/sysusers.c
+++ b/src/sysusers/sysusers.c
@@ -1312,6 +1312,8 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
 
                 h = groups;
                 break;
+        default:
+                return -EBADMSG;
         }
 
         i->type = action[0];