diff --git a/ext/pdo_sqlite/sqlite/src/experimental.c b/ext/pdo_sqlite/sqlite/src/experimental.c
index 0bb0ae334eb2c..ec40891a3aea8 100644
--- a/ext/pdo_sqlite/sqlite/src/experimental.c
+++ b/ext/pdo_sqlite/sqlite/src/experimental.c
@@ -15,6 +15,7 @@
 ** $Id$
 */
 #include "sqliteInt.h"
+#include "os.h"
 
 /*
 ** Set all the parameters in the compiled SQL statement to NULL.