diff --git a/source/pr_exec.c b/source/pr_exec.c
index 9242f05..d8aaab5 100644
--- a/source/pr_exec.c
+++ b/source/pr_exec.c
@@ -30,6 +30,8 @@
 # include "config.h"
 #endif
 
+#include <stdarg.h>
+
 #include "console.h"
 #include "cvar.h"
 #include "progs.h"