diff --git a/xkb.cpp b/xkb.cpp
--- a/xkb.cpp
+++ b/xkb.cpp
@@ -306,6 +306,7 @@
     }
     uchar *address = tmp->map(0, size);
     if (!address) {
+        delete tmp;
         return;
     }
     if (qstrncpy(reinterpret_cast<char*>(address), keymapString.data(), size) == nullptr) {