diff --git a/core/mac/inc/qwlan_version.h b/core/mac/inc/qwlan_version.h
index 56f6f842c4..e3e87632f3 100644
--- a/core/mac/inc/qwlan_version.h
+++ b/core/mac/inc/qwlan_version.h
@@ -32,9 +32,9 @@
 #define QWLAN_VERSION_MAJOR            5
 #define QWLAN_VERSION_MINOR            2
 #define QWLAN_VERSION_PATCH            1
-#define QWLAN_VERSION_EXTRA            "R"
+#define QWLAN_VERSION_EXTRA            "S"
 #define QWLAN_VERSION_BUILD            9
 
-#define QWLAN_VERSIONSTR               "5.2.1.9R"
+#define QWLAN_VERSIONSTR               "5.2.1.9S"
 
 #endif /* QWLAN_VERSION_H */