diff --git a/IkiWiki/Wrapper.pm b/IkiWiki/Wrapper.pm
index 739ee3173..1b8c558e5 100644
--- a/IkiWiki/Wrapper.pm
+++ b/IkiWiki/Wrapper.pm
@@ -182,6 +182,7 @@ EOF
 #include <stdlib.h>
 #include <string.h>
 #include <sys/file.h>
+#include <sys/wait.h>
 
 extern char **environ;
 int newenvironlen=0;