diff --git a/tests/SignalUtils.h b/tests/SignalUtils.h
index ece28ba..a2faf0a 100644
--- a/tests/SignalUtils.h
+++ b/tests/SignalUtils.h
@@ -55,3 +55,12 @@
  private:
   sigset64_t old_mask_;
 };
+
+// uint64_t equivalents of sigsetops.
+static inline void SignalSetAdd(uint64_t* sigset, int signo) {
+  *sigset |= 1ULL << (signo - 1);
+}
+
+static inline void SignalSetDel(uint64_t* sigset, int signo) {
+  *sigset &= ~(1ULL << (signo - 1));
+}