diff --git a/base/data-struct/hash.c b/base/data-struct/hash.c
index db3dcd543..7ef33c11b 100644
--- a/base/data-struct/hash.c
+++ b/base/data-struct/hash.c
@@ -41,7 +41,7 @@ struct dm_hash_table {
 static unsigned _hash(const void *key, unsigned len)
 {
 	/* Permutation of the Integers 0 through 255 */
-	static unsigned char _nums[] = {
+	static const unsigned char _nums[] = {
 	1, 14, 110, 25, 97, 174, 132, 119, 138, 170, 125, 118, 27, 233, 140, 51,
 	87, 197, 177, 107, 234, 169, 56, 68, 30, 7, 173, 73, 188, 40, 36, 65,
 	49, 213, 104, 190, 57, 211, 148, 223, 48, 115, 15, 2, 67, 186, 210, 28,
diff --git a/libdm/datastruct/hash.c b/libdm/datastruct/hash.c
index 054f5c359..b0ccc3a60 100644
--- a/libdm/datastruct/hash.c
+++ b/libdm/datastruct/hash.c
@@ -30,7 +30,7 @@ struct dm_hash_table {
 };
 
 /* Permutation of the Integers 0 through 255 */
-static unsigned char _nums[] = {
+static const unsigned char _nums[] = {
 	1, 14, 110, 25, 97, 174, 132, 119, 138, 170, 125, 118, 27, 233, 140, 51,
 	87, 197, 177, 107, 234, 169, 56, 68, 30, 7, 173, 73, 188, 40, 36, 65,
 	49, 213, 104, 190, 57, 211, 148, 223, 48, 115, 15, 2, 67, 186, 210, 28,
diff --git a/libdm/libdm-stats.c b/libdm/libdm-stats.c
index 66eb71238..7629a0ba6 100644
--- a/libdm/libdm-stats.c
+++ b/libdm/libdm-stats.c
@@ -2946,7 +2946,7 @@ static int _service_time(const struct dm_stats *dms, double *svctm,
 typedef int (*_metric_fn_t)(const struct dm_stats *, double *,
 			    uint64_t, uint64_t);
 
-_metric_fn_t _metrics[DM_STATS_NR_METRICS] = {
+const _metric_fn_t _metrics[DM_STATS_NR_METRICS] = {
 	_rd_merges_per_sec,
 	_wr_merges_per_sec,
 	_reads_per_sec,