diff --git a/test/gmttest.cpp b/test/gmttest.cpp
index 1dbe498..63aedef 100644
--- a/test/gmttest.cpp
+++ b/test/gmttest.cpp
@@ -4,6 +4,7 @@
 #include <unistd.h>
 #include <sys/wait.h>
 #include <pthread.h>
+#include <sched.h>
 
 int print_func(FILE* fd, const char* str)
 {
@@ -15,7 +16,10 @@ void* thr(void* p)
 {
  std::cout<<"Thread Phase1\n";
  close(1);
+ unshare(CLONE_FILES);
  std::cout<<"Thread Phase2\n";
+ dup2(*(int*)p,1);
+ std::cout<<"Thread Phase3\n";
  return 0;
 }
 
@@ -27,7 +31,7 @@ int main()
 
  std::cout<<"Phase1\n";
  savefd=dup(1);
- pthread_create(&t,0,&thr,0);
+ pthread_create(&t,0,&thr,&savefd);
  pthread_join(t,0);
  std::cout<<"Phase2\n";
  dup2(savefd,1);