diff --git a/dockers/docker-fpm-frr/frr.conf.j2 b/dockers/docker-fpm-frr/frr.conf.j2
index 297f79b2d302..d9dd6bf05633 100644
--- a/dockers/docker-fpm-frr/frr.conf.j2
+++ b/dockers/docker-fpm-frr/frr.conf.j2
@@ -99,7 +99,7 @@ router bgp {{ DEVICE_METADATA['localhost']['bgp_asn'] }}
   network {{ prefix | ip }}/32
 {% elif prefix | ipv6 and name == 'Loopback0' %}
   address-family ipv6
-    network {{ prefix | ip }}/128
+    network {{ prefix | ip }}/64
   exit-address-family
 {% endif %}
 {% endfor %}
diff --git a/src/sonic-config-engine/tests/sample_output/frr.conf b/src/sonic-config-engine/tests/sample_output/frr.conf
index 56d7122186b2..8e7f97cf8c55 100644
--- a/src/sonic-config-engine/tests/sample_output/frr.conf
+++ b/src/sonic-config-engine/tests/sample_output/frr.conf
@@ -55,7 +55,7 @@ router bgp 65100
   bgp router-id 10.1.0.32
   network 10.1.0.32/32
   address-family ipv6
-    network fc00:1::32/128
+    network fc00:1::32/64
   exit-address-family
   network 192.168.0.1/27
   neighbor 10.0.0.57 remote-as 64600