diff --git a/.azure-pipelines/linux-CI-keras-applications-nightly.yml b/.azure-pipelines/linux-CI-keras-applications-nightly.yml
index c840159e..c28b82f5 100644
--- a/.azure-pipelines/linux-CI-keras-applications-nightly.yml
+++ b/.azure-pipelines/linux-CI-keras-applications-nightly.yml
@@ -53,7 +53,7 @@ jobs:
       pip install tensorflow==1.14.0
       pip install $(KERAS)
       pip install -r requirements.txt
-      git clone https://github.com/microsoft/onnxconverter-common@r1.6
+      git clone -b r1.6 https://github.com/microsoft/onnxconverter-common
       cd onnxconverter-common
       pip install -e .
       cd ..
diff --git a/.azure-pipelines/win32-CI-keras-applications-nightly.yml b/.azure-pipelines/win32-CI-keras-applications-nightly.yml
index d9c31a55..31e46e95 100644
--- a/.azure-pipelines/win32-CI-keras-applications-nightly.yml
+++ b/.azure-pipelines/win32-CI-keras-applications-nightly.yml
@@ -56,7 +56,7 @@ jobs:
       pip install tensorflow==1.14.0
       pip install %KERAS%
       pip install -r requirements.txt
-      git clone https://github.com/microsoft/onnxconverter-common@r1.6
+      git clone -b r1.6 https://github.com/microsoft/onnxconverter-common
       cd onnxconverter-common
       pip install -e .
       cd ..