diff --git a/WHATS_NEW_DM b/WHATS_NEW_DM
index ee3e69852..657847728 100644
--- a/WHATS_NEW_DM
+++ b/WHATS_NEW_DM
@@ -1,5 +1,6 @@
 Version 1.02.47 -
 =================================
+  Add dm_bit_and.
   Simplify dm_bitset_create.
   Speed up dm_bit_get_next with ffs().
 
diff --git a/libdm/datastruct/bitset.c b/libdm/datastruct/bitset.c
index bb16adda6..6dd5952a6 100644
--- a/libdm/datastruct/bitset.c
+++ b/libdm/datastruct/bitset.c
@@ -42,6 +42,13 @@ void dm_bitset_destroy(dm_bitset_t bs)
 	dm_free(bs);
 }
 
+void dm_bit_and(dm_bitset_t out, dm_bitset_t in1, dm_bitset_t in2)
+{
+	int i;
+
+	for (i = (in1[0] / DM_BITS_PER_INT) + 1; i; i--)
+		out[i] = in1[i] & in2[i];
+}
 void dm_bit_union(dm_bitset_t out, dm_bitset_t in1, dm_bitset_t in2)
 {
 	int i;