diff --git a/qemu-img.c b/qemu-img.c
index 04ce02a..1ad899e 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -70,11 +70,8 @@
 {
     GSequence *seq = opaque;
 
-    if (!g_sequence_lookup(seq, (gpointer)fmt_name,
-                           compare_data, NULL)) {
-        g_sequence_insert_sorted(seq, (gpointer)fmt_name,
-                                 compare_data, NULL);
-    }
+    g_sequence_insert_sorted(seq, (gpointer)fmt_name,
+                             compare_data, NULL);
 }
 
 static void QEMU_NORETURN GCC_FMT_ATTR(1, 2) error_exit(const char *fmt, ...)