diff --git a/dockers/docker-sonic-mgmt/Dockerfile.j2 b/dockers/docker-sonic-mgmt/Dockerfile.j2
index 4c53baf7c485..4a7e1a977549 100644
--- a/dockers/docker-sonic-mgmt/Dockerfile.j2
+++ b/dockers/docker-sonic-mgmt/Dockerfile.j2
@@ -143,4 +143,6 @@ RUN azure-cli_bundle_*/installer
 # TODO: if azure-cli contains newer version azure-keyvault, remove this
 RUN ~/lib/azure-cli/bin/python -m pip install azure-keyvault==0.3.7 -U
 
+RUN pip install pysubnettree
+
 RUN git clone https://github.com/Azure/sonic-mgmt