diff --git a/extract.sh b/extract.sh
new file mode 100755
index 0000000..210d714
--- /dev/null
+++ b/extract.sh
@@ -0,0 +1,2 @@
+#!/usr/bin/sh
+go run ./tools/mpq/*.go --target="./asset" extract ./mpq/*.mpq
diff --git a/tools/mpq/mpq.go b/tools/mpq/mpq.go
index db2b2ef..4e1dc1e 100644
--- a/tools/mpq/mpq.go
+++ b/tools/mpq/mpq.go
@@ -76,11 +76,13 @@ func extract(mpqPath, filter, targetDir string) error {
 		if err != nil {
 			return err
 		}
-		defer sysFile.Close()
 
 		if _, err := io.Copy(sysFile, resFile); err != nil {
+			sysFile.Close()
 			return err
 		}
+
+		sysFile.Close()
 	}
 
 	return nil