diff --git a/include/sys/dbuf.h b/include/sys/dbuf.h
index 6ae079c6a6..d2c175af64 100644
--- a/include/sys/dbuf.h
+++ b/include/sys/dbuf.h
@@ -465,7 +465,7 @@ dbuf_find_dirty_eq(dmu_buf_impl_t *db, uint64_t txg)
 	char __db_buf[32]; \
 	uint64_t __db_obj = (dbuf)->db.db_object; \
 	if (__db_obj == DMU_META_DNODE_OBJECT) \
-		(void) strcpy(__db_buf, "mdn"); \
+		(void) strlcpy(__db_buf, "mdn", sizeof (__db_buf));	\
 	else \
 		(void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \
 		    (u_longlong_t)__db_obj); \
diff --git a/include/sys/dnode.h b/include/sys/dnode.h
index de6492bb76..2cdc5b8798 100644
--- a/include/sys/dnode.h
+++ b/include/sys/dnode.h
@@ -600,7 +600,7 @@ extern dnode_stats_t dnode_stats;
 	char __db_buf[32]; \
 	uint64_t __db_obj = (dn)->dn_object; \
 	if (__db_obj == DMU_META_DNODE_OBJECT) \
-		(void) strcpy(__db_buf, "mdn"); \
+		(void) strlcpy(__db_buf, "mdn", sizeof (__db_buf));	\
 	else \
 		(void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \
 		    (u_longlong_t)__db_obj);\