diff --git a/src/audio/arts/SDL_artsaudio.c b/src/audio/arts/SDL_artsaudio.c
index 3a14f45fc..b0c0a9ca3 100644
--- a/src/audio/arts/SDL_artsaudio.c
+++ b/src/audio/arts/SDL_artsaudio.c
@@ -23,6 +23,11 @@
 
 /* Allow access to a raw mixing buffer */
 
+#ifdef HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+#include <unistd.h>
+
 #include "SDL_timer.h"
 #include "SDL_audio.h"
 #include "../SDL_audiomem.h"