diff --git a/src/include/switch_apr.h b/src/include/switch_apr.h
index 94157b46f6..7fc41dd926 100644
--- a/src/include/switch_apr.h
+++ b/src/include/switch_apr.h
@@ -76,6 +76,7 @@ SWITCH_BEGIN_EXTERN_C
  * @{
  */	
 
+#define SWITCH_SIZE_T_FMT APR_SIZE_T_FMT
 typedef apr_size_t swtich_size_t;
 typedef apr_int16_t switch_int16_t;