diff --git a/Kconfig b/Kconfig
index 2ab3e99..f3a7ff6 100644
--- a/Kconfig
+++ b/Kconfig
@@ -97,6 +97,11 @@ config SDFAT_DBG_BUGON
 	depends on SDFAT_FS && SDFAT_DEBUG
 	default n
 
+config SDFAT_DBG_WARNON
+	bool "enable strict WARN_ON() for debugging"
+	depends on SDFAT_FS && SDFAT_DEBUG
+	default n
+
 config SDFAT_STATISTICS
 	bool "enable statistics for bigdata"
 	depends on SDFAT_FS
diff --git a/sdfat.h b/sdfat.h
index 2f10b96..a4b7ed3 100644
--- a/sdfat.h
+++ b/sdfat.h
@@ -393,6 +393,7 @@ void sdfat_debug_check_clusters(struct inode *inode);
 
 #define sdfat_debug_check_clusters(inode)
 #define sdfat_debug_bug_on(expr)
+#define sdfat_debug_warn_on(expr)
 
 #endif /* CONFIG_SDFAT_DEBUG */