diff --git a/rostests/winetests/mshtml/activex.c b/rostests/winetests/mshtml/activex.c
index b6a1388bef3..65342905682 100644
--- a/rostests/winetests/mshtml/activex.c
+++ b/rostests/winetests/mshtml/activex.c
@@ -21,7 +21,7 @@
 
 #include <wine/test.h>
 //#include <stdarg.h>
-//#include <stdio.h>
+#include <stdio.h>
 
 //#include "windef.h"
 //#include "winbase.h"
diff --git a/rostests/winetests/mshtml/events.c b/rostests/winetests/mshtml/events.c
index 142a7841810..e985dbae5d7 100644
--- a/rostests/winetests/mshtml/events.c
+++ b/rostests/winetests/mshtml/events.c
@@ -21,7 +21,7 @@
 
 #include <wine/test.h>
 //#include <stdarg.h>
-//#include <stdio.h>
+#include <stdio.h>
 
 //#include "windef.h"
 //#include "winbase.h"
diff --git a/rostests/winetests/mshtml/htmldoc.c b/rostests/winetests/mshtml/htmldoc.c
index 270a2d8df91..06d2231865b 100644
--- a/rostests/winetests/mshtml/htmldoc.c
+++ b/rostests/winetests/mshtml/htmldoc.c
@@ -21,7 +21,7 @@
 
 #include <wine/test.h>
 //#include <stdarg.h>
-//#include <stdio.h>
+#include <stdio.h>
 
 //#include "windef.h"
 //#include "winbase.h"
diff --git a/rostests/winetests/mshtml/script.c b/rostests/winetests/mshtml/script.c
index 3a07cc08598..91728b74936 100644
--- a/rostests/winetests/mshtml/script.c
+++ b/rostests/winetests/mshtml/script.c
@@ -21,7 +21,7 @@
 
 #include <wine/test.h>
 //#include <stdarg.h>
-//#include <stdio.h>
+#include <stdio.h>
 
 //#include "windef.h"
 //#include "winbase.h"