diff --git a/src/coreclr/gc/unix/events.cpp b/src/coreclr/gc/unix/events.cpp
index 7cc55680aaf2f..767b414f04c17 100644
--- a/src/coreclr/gc/unix/events.cpp
+++ b/src/coreclr/gc/unix/events.cpp
@@ -131,6 +131,7 @@ class GCEvent::Impl
         if (milliseconds != INFINITE)
         {
             uint64_t nanoseconds = (uint64_t)milliseconds * tccMilliSecondsToNanoSeconds;
+            NanosecondsToTimeSpec(nanoseconds, &endTime);
             endMachTime = clock_gettime_nsec_np(CLOCK_UPTIME_RAW) + nanoseconds;
         }
 #elif HAVE_PTHREAD_CONDATTR_SETCLOCK