diff --git a/zathura/database-plain.c b/zathura/database-plain.c
index e64feda..22e4636 100644
--- a/zathura/database-plain.c
+++ b/zathura/database-plain.c
@@ -672,7 +672,12 @@ zathura_db_read_key_file_from_file(const char* path)
 
     free(content);
     content = malloc(sizeof(char) * (dummy_len + 1));
-    content = memcpy(content, dummy_content, dummy_len + 1);
+    if (content == NULL)
+    {
+      g_key_file_free(key_file);
+      return NULL;
+    }
+    g_strlcat(content, dummy_content, dummy_len + 1);
     contentlen = dummy_len;
   }