diff --git a/mozilla/xpcom/typelib/xpt/src/xpt_struct.c b/mozilla/xpcom/typelib/xpt/src/xpt_struct.c
index 51ac1e26979..dbc1c004bd8 100644
--- a/mozilla/xpcom/typelib/xpt/src/xpt_struct.c
+++ b/mozilla/xpcom/typelib/xpt/src/xpt_struct.c
@@ -21,6 +21,7 @@
 #include "xpt_xdr.h"
 #include "xpt_struct.h"
 #include <string.h>
+#include <stdio.h>
 
 #ifdef XP_MAC
 static char *strdup(const char *c)
diff --git a/mozilla/xpcom/typelib/xpt/tests/SimpleTypeLib.c b/mozilla/xpcom/typelib/xpt/tests/SimpleTypeLib.c
index 1f02b2c70a4..470a5a18c31 100644
--- a/mozilla/xpcom/typelib/xpt/tests/SimpleTypeLib.c
+++ b/mozilla/xpcom/typelib/xpt/tests/SimpleTypeLib.c
@@ -17,6 +17,7 @@
  */
 
 /* Test the structure creation and serialization APIs from xpt_struct.c */
+#include <stdio.h>
 
 #include "xpt_xdr.h"
 #include "xpt_struct.h"