diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 67ec2e927253ef47077e3b7daf91ff8d3998ecd4..655a5a9a183d732dc332b2c926a87c8a4f714efa 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -21,6 +21,7 @@
 #undef DEBUG
 #undef DEBUG_LOW
 
+#define pr_fmt(fmt) "hash-mmu: " fmt
 #include <linux/spinlock.h>
 #include <linux/errno.h>
 #include <linux/sched/mm.h>