diff --git a/repl/lib_fileio.c b/repl/lib_fileio.c
index f207fe1..7548259 100644
--- a/repl/lib_fileio.c
+++ b/repl/lib_fileio.c
@@ -486,6 +486,7 @@ static int nativeSeek(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments)
 	Toy_pushLiteralArray(&interpreter->stack, resultLiteral);
 
 	// cleanup
+	Toy_deleteRefString(orginString);
 	Toy_freeLiteral(resultLiteral);
 	Toy_freeLiteral(offsetLiteral);
 	Toy_freeLiteral(selfLiteral);
diff --git a/test/scripts/lib/fileio.toy b/test/scripts/lib/fileio.toy
index 925f1e5..fc14fb6 100644
--- a/test/scripts/lib/fileio.toy
+++ b/test/scripts/lib/fileio.toy
@@ -42,7 +42,6 @@ fn reset() {
     writer.close();
 }
 
-
 // test open and close
 {
     var reader = open(PATH, "r");
@@ -145,4 +144,8 @@ fn reset() {
     reader.close();
 }
 
+// standard in/out are closed to prevent memory leaks
+input.close();
+output.close();
+
 print "All good";
\ No newline at end of file