diff --git a/package/owipcalc/Makefile b/package/owipcalc/Makefile
index 9ff9b24c2c..ec65c84c96 100644
--- a/package/owipcalc/Makefile
+++ b/package/owipcalc/Makefile
@@ -7,7 +7,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=owipcalc
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 include $(INCLUDE_DIR)/package.mk
 
diff --git a/package/owipcalc/src/owipcalc.c b/package/owipcalc/src/owipcalc.c
index 6d7a8aaf43..06d163e2f8 100644
--- a/package/owipcalc/src/owipcalc.c
+++ b/package/owipcalc/src/owipcalc.c
@@ -518,6 +518,12 @@ static bool cidr_howmany(struct cidr *a, struct cidr *b)
 	return true;
 }
 
+static bool cidr_prefix(struct cidr *a, struct cidr *b)
+{
+	a->prefix = b->prefix;
+	return true;
+}
+
 static bool cidr_quiet(struct cidr *a)
 {
 	quiet = true;
@@ -545,6 +551,11 @@ struct op ops[] = {
 	  .desc = "Turn base address into broadcast address",
 	  .f4.a1 = cidr_broadcast4 },
 
+	{ .name = "prefix",
+	  .desc = "Set the prefix of base address to argument",
+	  .f4.a2 = cidr_prefix,
+	  .f6.a2 = cidr_prefix },
+
 	{ .name = "netmask",
 	  .desc = "Print netmask of base address, does not change base address",
 	  .f4.a1 = cidr_netmask4 },