diff --git a/apps/openmw/main.cpp b/apps/openmw/main.cpp
index 672a65d37f..4f77c1b1ad 100644
--- a/apps/openmw/main.cpp
+++ b/apps/openmw/main.cpp
@@ -18,6 +18,7 @@
 
 
 #if OGRE_PLATFORM == OGRE_PLATFORM_LINUX || OGRE_PLATFORM == OGRE_PLATFORM_APPLE
+#include <csignal>
 extern int cc_install_handlers(int argc, char **argv, int num_signals, int *sigs, const char *logfile, int (*user_info)(char*, char*));
 extern int is_debugger_attached(void);
 #endif