diff --git a/scst/include/backport.h b/scst/include/backport.h
index 2b774a8a9..1b730cc41 100644
--- a/scst/include/backport.h
+++ b/scst/include/backport.h
@@ -1401,6 +1401,17 @@ static inline void sg_unmark_end(struct scatterlist *sg)
 #define set_cpus_allowed_ptr(p, new_mask) set_cpus_allowed((p), *(new_mask))
 #endif
 
+/* <linux/sched/prio.h> */
+
+/*
+ * See also commit 3ee237dddcd8 ("sched/prio: Add 3 macros of MAX_NICE,
+ * MIN_NICE and NICE_WIDTH in prio.h") # v3.15.
+ */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0) && \
+	(!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7)
+#define MIN_NICE -20
+#endif
+
 /* <linux/slab.h> */
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22)