diff --git a/spec/ffi/fixtures/PipeHelperWindows.c b/spec/ffi/fixtures/PipeHelperWindows.c
index 470bacc14..0bdbd2ec8 100644
--- a/spec/ffi/fixtures/PipeHelperWindows.c
+++ b/spec/ffi/fixtures/PipeHelperWindows.c
@@ -6,6 +6,7 @@
 
 #ifdef _WIN32
 #include <windows.h>
+#include <stdio.h>
 #include "PipeHelper.h"
 
 int pipeHelperCreatePipe(FD_TYPE pipefd[2])