diff --git a/objcutil.go b/objcutil.go
index 8b49dd2e..725404c8 100644
--- a/objcutil.go
+++ b/objcutil.go
@@ -108,14 +108,14 @@ void* getNSArrayItem(void *ptr, int i)
 	return [arr objectAtIndex:i];
 }
 
-const char *getUUID()
+ char *getUUID()
 {
-	const char *ret;
+	char *ret;
 	@autoreleasepool {
 		NSString *uuid = [[NSUUID UUID] UUIDString];
-		ret = [uuid UTF8String];
+		ret = strdup([uuid UTF8String]);
 	}
-	return ret;
+	return ret
 }
 */
 import "C"
diff --git a/virtualization.go b/virtualization.go
index 9e335d50..b6c011c2 100644
--- a/virtualization.go
+++ b/virtualization.go
@@ -93,9 +93,9 @@ type machineStatus struct {
 // A new dispatch queue will create when called this function.
 // Every operation on the virtual machine must be done on that queue. The callbacks and delegate methods are invoked on that queue.
 func NewVirtualMachine(config *VirtualMachineConfiguration) *VirtualMachine {
-	// should not call Free function for this string.
 	cs := getUUID()
 	dispatchQueue := C.makeDispatchQueue(cs.CString())
+	cs.Free()
 
 	status := cgo.NewHandle(&machineStatus{
 		state:       VirtualMachineState(0),