diff --git a/src/common/portable.c b/src/common/portable.c
index dcc0fba1..05a6c281 100644
--- a/src/common/portable.c
+++ b/src/common/portable.c
@@ -1,4 +1,4 @@
-#include  <io.h>
+#include <io.h>
 
 int
 portable_mode ()