diff --git a/tests/memleaks.sh b/tests/memleaks.sh
index 2faeb43..b85dac3 100755
--- a/tests/memleaks.sh
+++ b/tests/memleaks.sh
@@ -10,7 +10,6 @@
 
 # ---------------------------- Tests -----------------------------------
 
-
 function test_thread_free { #threads
 	echo "Testing creation and destruction of threads(=$1)"
 	compile src/no_work.c
diff --git a/thpool.c b/thpool.c
index 38c4d38..3d682cd 100644
--- a/thpool.c
+++ b/thpool.c
@@ -308,6 +308,8 @@ static void* thread_do(struct thread* thread_p){
 	
 	/* Register signal handler */
 	struct sigaction act;
+	sigemptyset(&act.sa_mask);
+	act.sa_flags = 0;
 	act.sa_handler = thread_hold;
 	if (sigaction(SIGUSR1, &act, NULL) == -1) {
 		fprintf(stderr, "thread_do(): cannot handle SIGUSR1");