diff --git a/kernel/src/sys/signal.cpp b/kernel/src/sys/signal.cpp
index e81952a0..2bde914b 100644
--- a/kernel/src/sys/signal.cpp
+++ b/kernel/src/sys/signal.cpp
@@ -88,9 +88,9 @@ Result<u64> sys_sigprocmask(Registers*, SyscallArgs args)
 
         switch (how)
         {
-        case SIG_BLOCK: current->signal_mask |= kset;
-        case SIG_UNBLOCK: current->signal_mask &= ~kset;
-        case SIG_SETMASK: current->signal_mask = kset;
+        case SIG_BLOCK: current->signal_mask |= kset; break;
+        case SIG_UNBLOCK: current->signal_mask &= ~kset; break;
+        case SIG_SETMASK: current->signal_mask = kset; break;
         default: return err(EINVAL);
         }
     }