diff --git a/src/modules/alsa/alsa-source.c b/src/modules/alsa/alsa-source.c
index 97092bb5b..dfad8170b 100644
--- a/src/modules/alsa/alsa-source.c
+++ b/src/modules/alsa/alsa-source.c
@@ -24,6 +24,7 @@
 #include <config.h>
 #endif
 
+#include <signal.h>
 #include <stdio.h>
 
 #include <asoundlib.h>