diff --git a/src/wdt.c b/src/wdt.c
index 45438d6..60a5fd4 100644
--- a/src/wdt.c
+++ b/src/wdt.c
@@ -60,7 +60,7 @@
 		 * the thread number from there. Note: this thread might
 		 * continue to execute in parallel.
 		 */
-		thr = si->si_int;
+		thr = si->si_value.sival_int;
 
 		/* cannot happen unless an unknown timer tries to play with our
 		 * nerves. Let's die for now if this happens.