diff --git a/stepmania/src/archutils/Unix/arch_setup.h b/stepmania/src/archutils/Unix/arch_setup.h
index daad6a0055..769e085d72 100644
--- a/stepmania/src/archutils/Unix/arch_setup.h
+++ b/stepmania/src/archutils/Unix/arch_setup.h
@@ -5,6 +5,8 @@
 #include <stdint.h>
 #endif
 
+#include <alloca.h>
+
 #ifdef HAVE_SYS_PARAM_H
 #include <sys/param.h>
 #endif