diff --git a/.ci/azure-pipelines/build-macos.yml b/.ci/azure-pipelines/build-macos.yml
index 94a3ec4a791..ca809054328 100644
--- a/.ci/azure-pipelines/build-macos.yml
+++ b/.ci/azure-pipelines/build-macos.yml
@@ -7,7 +7,7 @@ jobs:
     variables:
       BUILD_DIR: '$(Agent.WorkFolder)/build'
       GOOGLE_TEST_DIR: '$(Agent.WorkFolder)/googletest'
-      CMAKE_CXX_FLAGS: '-Wall -Wextra -Wabi -O2'
+      CMAKE_CXX_FLAGS: '-Wall -Wextra -Wabi -Werror -O2'
     steps:
       - script: |
           brew install pkg-config qt5 libpcap brewsci/science/openni
diff --git a/.ci/azure-pipelines/build-ubuntu-16-04.yaml b/.ci/azure-pipelines/build-ubuntu-16-04.yaml
index a6003002023..d1077c076f0 100644
--- a/.ci/azure-pipelines/build-ubuntu-16-04.yaml
+++ b/.ci/azure-pipelines/build-ubuntu-16-04.yaml
@@ -12,7 +12,7 @@ jobs:
     container: env1604
     variables:
       BUILD_DIR: '$(Agent.BuildDirectory)/build'
-      CMAKE_CXX_FLAGS: '-Wall -Wextra -O2'
+      CMAKE_CXX_FLAGS: '-Wall -Wextra -Werror -O2'
     steps:
       - script: |
           mkdir $BUILD_DIR && cd $BUILD_DIR
diff --git a/.ci/azure-pipelines/build-ubuntu-19-10.yaml b/.ci/azure-pipelines/build-ubuntu-19-10.yaml
index bb1b70f382d..9f83fcbf823 100644
--- a/.ci/azure-pipelines/build-ubuntu-19-10.yaml
+++ b/.ci/azure-pipelines/build-ubuntu-19-10.yaml
@@ -12,7 +12,7 @@ jobs:
     container: env1910
     variables:
       BUILD_DIR: '$(Agent.BuildDirectory)/build'
-      CMAKE_CXX_FLAGS: '-Wall -Wextra -O2'
+      CMAKE_CXX_FLAGS: '-Wall -Wextra -Werror -O2'
     steps:
       - script: |
           mkdir $BUILD_DIR && cd $BUILD_DIR