diff --git a/src/pulsecore/rtsig.c b/src/pulsecore/rtsig.c
index 1b8cdaa36..a3226a0e6 100644
--- a/src/pulsecore/rtsig.c
+++ b/src/pulsecore/rtsig.c
@@ -32,6 +32,7 @@
 #include <pulsecore/flist.h>
 #include <pulsecore/once.h>
 #include <pulsecore/thread.h>
+#include <pulsecore/core-util.h>
 
 #include "rtsig.h"