diff --git a/core/mac/inc/qwlan_version.h b/core/mac/inc/qwlan_version.h
index 2ac8f5f3d0..256b3e69b9 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            72
 
-#define QWLAN_VERSIONSTR               "5.2.1.72R"
+#define QWLAN_VERSIONSTR               "5.2.1.72S"
 
 #endif /* QWLAN_VERSION_H */