diff --git a/scst/include/scst_debug.h b/scst/include/scst_debug.h
index 22145e7bd..d7c689bf1 100644
--- a/scst/include/scst_debug.h
+++ b/scst/include/scst_debug.h
@@ -53,7 +53,6 @@
         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_warning(fmt, ...) \
         printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
-#define pr_warn pr_warning
 #define pr_notice(fmt, ...) \
         printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 #endif
@@ -68,6 +67,15 @@
         printk(KERN_CONT fmt, ##__VA_ARGS__)
 #endif
 #endif
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 33)
+/*
+ * See also patch "kernel.h: add pr_warn for symmetry to dev_warn,
+ * netdev_warn" (commit fc62f2f19edf46c9bdbd1a54725b56b18c43e94f).
+ */
+#ifndef pr_warn
+#define pr_warn pr_warning
+#endif
+#endif
 
 #if !defined(INSIDE_KERNEL_TREE)
 #ifdef CONFIG_SCST_DEBUG