diff --git a/src/lib9/fmt/runevsmprint.c b/src/lib9/fmt/runevsmprint.c
index d1b25f30..80b96ab2 100644
--- a/src/lib9/fmt/runevsmprint.c
+++ b/src/lib9/fmt/runevsmprint.c
@@ -19,6 +19,7 @@
 #ifdef PLAN9PORT
 #include <u.h>
 #include <libc.h>
+#include "fmtdef.h"
 #else
 #include <stdlib.h>
 #include "plan9.h"
diff --git a/src/lib9/fmt/vsmprint.c b/src/lib9/fmt/vsmprint.c
index b6cf187c..f6d86b80 100644
--- a/src/lib9/fmt/vsmprint.c
+++ b/src/lib9/fmt/vsmprint.c
@@ -19,6 +19,7 @@
 #ifdef PLAN9PORT
 #include <u.h>
 #include <libc.h>
+#include "fmtdef.h"
 #else
 #include <stdlib.h>
 #include "plan9.h"