diff --git a/libfreefare/freefare.c b/libfreefare/freefare.c
index 8d26d27..87503cd 100644
--- a/libfreefare/freefare.c
+++ b/libfreefare/freefare.c
@@ -188,9 +188,11 @@ freefare_get_tag_friendly_name (MifareTag tag)
 char *
 freefare_get_tag_uid (MifareTag tag)
 {
-    char *res = malloc (2 * tag->info.szUidLen + 1);
+    char *res;
+    if ((res = malloc (2 * tag->info.szUidLen + 1))) {
     for (size_t i =0; i < tag->info.szUidLen; i++)
         snprintf (res + 2*i, 3, "%02x", tag->info.abtUid[i]);
+    }
     return res;
 }