diff --git a/MySQLdb/_mysql.c b/MySQLdb/_mysql.c
index 5e929ab..ae2b2bb 100644
--- a/MySQLdb/_mysql.c
+++ b/MySQLdb/_mysql.c
@@ -39,6 +39,7 @@ PERFORMANCE OF THIS SOFTWARE.
 
 #include "structmember.h"
 #include "mysql.h"
+#include "my_config.h"
 #include "mysqld_error.h"
 #include "errmsg.h"