diff --git a/src/system/kernel/team.c b/src/system/kernel/team.c
index b0feb4cd49..3df96721cc 100644
--- a/src/system/kernel/team.c
+++ b/src/system/kernel/team.c
@@ -53,10 +53,11 @@ struct team_arg {
 };
 
 struct fork_arg {
-	area_id	user_stack_area;
-	addr_t	user_stack_base;
-	size_t	user_stack_size;
-	addr_t	user_local_storage;
+	area_id		user_stack_area;
+	addr_t		user_stack_base;
+	size_t		user_stack_size;
+	addr_t		user_local_storage;
+	sigset_t	sig_block_mask;
 
 	struct arch_fork_arg arch_info;
 };
@@ -1369,6 +1370,7 @@ fork_team_thread_start(void *_args)
 	thread->user_stack_base = forkArgs->user_stack_base;
 	thread->user_stack_size = forkArgs->user_stack_size;
 	thread->user_local_storage = forkArgs->user_local_storage;
+	thread->sig_block_mask = forkArgs->sig_block_mask;
 
 	arch_thread_init_tls(thread);
 
@@ -1462,6 +1464,7 @@ fork_team(void)
 	forkArgs->user_stack_base = parentThread->user_stack_base;
 	forkArgs->user_stack_size = parentThread->user_stack_size;
 	forkArgs->user_local_storage = parentThread->user_local_storage;
+	forkArgs->sig_block_mask = parentThread->sig_block_mask;
 	arch_store_fork_frame(&forkArgs->arch_info);
 
 	// ToDo: copy image list