diff --git a/ext/mysql2/result.h b/ext/mysql2/result.h
index c637d9e..39485b0 100644
--- a/ext/mysql2/result.h
+++ b/ext/mysql2/result.h
@@ -11,7 +11,7 @@ typedef struct {
   long numberOfFields;
   unsigned long numberOfRows;
   unsigned long lastRowProcessed;
-  short int resultFreed;
+  char resultFreed;
   MYSQL_RES *result;
 } mysql2_result_wrapper;