diff --git a/test/libsinsp_e2e/forking.cpp b/test/libsinsp_e2e/forking.cpp
index 5d6473fe89..3b59587b09 100644
--- a/test/libsinsp_e2e/forking.cpp
+++ b/test/libsinsp_e2e/forking.cpp
@@ -336,6 +336,7 @@ static int clone_callback_1(void* arg)
 	// using a weird clone() here something goes wrong with
 	// recent version of glibc
 	ctid = syscall(SYS_getpid);
+	fsync(cp->fd);
 	close(cp->fd);
 	return 0;
 }