diff --git a/stepmania/src/archutils/Unix/SignalHandler.cpp b/stepmania/src/archutils/Unix/SignalHandler.cpp
index d77a0caabb..f9a7d2df2c 100644
--- a/stepmania/src/archutils/Unix/SignalHandler.cpp
+++ b/stepmania/src/archutils/Unix/SignalHandler.cpp
@@ -4,6 +4,7 @@
 #include "SignalHandler.h"
 #include "GetSysInfo.h"
 
+#include <signal.h>
 #include <cstdlib>
 #include <unistd.h>
 #include <sys/mman.h>