diff --git a/OpenChange/MAPIStoreMapping.m b/OpenChange/MAPIStoreMapping.m
index 08c520b32..7e8dca116 100644
--- a/OpenChange/MAPIStoreMapping.m
+++ b/OpenChange/MAPIStoreMapping.m
@@ -20,6 +20,8 @@
  * Boston, MA 02111-1307, USA.
  */
 
+#include <inttypes.h>
+
 #import <Foundation/NSArray.h>
 #import <Foundation/NSDictionary.h>
 #import <Foundation/NSException.h>