diff --git a/libs/main/thread/piconditionvar.cpp b/libs/main/thread/piconditionvar.cpp
index f7743d0a..9480bb79 100644
--- a/libs/main/thread/piconditionvar.cpp
+++ b/libs/main/thread/piconditionvar.cpp
@@ -91,7 +91,7 @@ void timespec_add_ms(timespec* ts, int ms) {
     ts->tv_nsec += ms % 1000 * 1000000;
     if (ts->tv_nsec > 1000 * 1000 * 1000) {
         ts->tv_sec++;
-        ts->tv_nsec /= 1000 * 1000 * 1000;
+        ts->tv_nsec -= 1000 * 1000 * 1000;
     }
 }