diff --git a/tools/Dockerfile b/tools/Dockerfile
index dc39adf01288f092143803557b322a0c8fbcb2b4..3c701725400350247153f828410d06cec69856f5 100644
--- a/tools/Dockerfile
+++ b/tools/Dockerfile
@@ -9,4 +9,6 @@ RUN yum -y install wget && \
     yum -y install python3 python3-devel && \
     yum clean all && \
     curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py && \
-    python get-pip.py && rm get-pip.py
+    python get-pip.py && rm get-pip.py && \
+    localedef -c -i en_US -f UTF-8 en_US.UTF-8 && \
+    echo "export LANG=en_US.utf8" >> /root/.bashrc
diff --git a/tools/Dockerfile.centos6.devel b/tools/Dockerfile.centos6.devel
index 5223693d846bdbc90bdefe58c26db29d6a81359d..83981dcc4731252dfc75270b5ce6fc623a0266a8 100644
--- a/tools/Dockerfile.centos6.devel
+++ b/tools/Dockerfile.centos6.devel
@@ -44,4 +44,6 @@ RUN yum -y install wget && \
     cd .. && rm -rf Python-3.6.8* && \
     pip3 install google protobuf setuptools wheel flask numpy==1.16.4 && \
     yum -y install epel-release && yum -y install patchelf libXext libSM libXrender && \
-    yum clean all
+    yum clean all && \
+    localedef -c -i en_US -f UTF-8 en_US.UTF-8 && \
+    echo "export LANG=en_US.utf8" >> /root/.bashrc
diff --git a/tools/Dockerfile.centos6.gpu.devel b/tools/Dockerfile.centos6.gpu.devel
index 1432d49abe9a4aec3b558d855c9cfcf30efef461..9ee3591b9a1e2ea5881106cf7e67ca28b24c1890 100644
--- a/tools/Dockerfile.centos6.gpu.devel
+++ b/tools/Dockerfile.centos6.gpu.devel
@@ -44,4 +44,5 @@ RUN yum -y install wget && \
     cd .. && rm -rf Python-3.6.8* && \
     pip3 install google protobuf setuptools wheel flask numpy==1.16.4 && \
     yum -y install epel-release && yum -y install patchelf libXext libSM libXrender && \
-    yum clean all
+    yum clean all && \
+    echo "export LANG=en_US.utf8" >> /root/.bashrc
diff --git a/tools/Dockerfile.devel b/tools/Dockerfile.devel
index 385e568273eab54f7dfa51a20bb7dcd89cfa98a8..e4bcd33534cb9e887f49fcba5029619aaa1dea4c 100644
--- a/tools/Dockerfile.devel
+++ b/tools/Dockerfile.devel
@@ -21,4 +21,6 @@ RUN yum -y install wget >/dev/null \
     && yum install -y python3 python3-devel \
     && pip3 install google protobuf setuptools wheel flask \
     && yum -y install epel-release && yum -y install patchelf libXext libSM libXrender\
-    && yum clean all
+    && yum clean all \
+    && localedef -c -i en_US -f UTF-8 en_US.UTF-8 \
+    && echo "export LANG=en_US.utf8" >> /root/.bashrc
diff --git a/tools/Dockerfile.gpu b/tools/Dockerfile.gpu
index bf05080ca72e90b2179f6a717f6f4e86e7aefe29..2f38a3a3cd1c8987d34a81259ec9ad6ba67156a7 100644
--- a/tools/Dockerfile.gpu
+++ b/tools/Dockerfile.gpu
@@ -15,6 +15,7 @@ RUN yum -y install wget && \
     echo 'export LD_LIBRARY_PATH=/usr/local/cuda/lib64:$LD_LIBRARY_PATH' >> /root/.bashrc && \
     ln -s /usr/local/cuda-9.0/targets/x86_64-linux/lib/libcudnn.so.7 /usr/local/cuda-9.0/targets/x86_64-linux/lib/libcudnn.so && \
     echo 'export LD_LIBRARY_PATH=/usr/local/cuda-9.0/targets/x86_64-linux/lib:$LD_LIBRARY_PATH' >> /root/.bashrc && \
+    echo "export LANG=en_US.utf8" >> /root/.bashrc && \
     mkdir -p /usr/local/cuda/extras
 
 COPY --from=builder /usr/local/cuda/extras/CUPTI /usr/local/cuda/extras/CUPTI
diff --git a/tools/Dockerfile.gpu.devel b/tools/Dockerfile.gpu.devel
index 2ffbe4601e1f7e9b05c87f9562b3e0ffc4b967ff..057201cefa1f8de7a105ea9b7f93e7ca9e342777 100644
--- a/tools/Dockerfile.gpu.devel
+++ b/tools/Dockerfile.gpu.devel
@@ -22,4 +22,5 @@ RUN yum -y install wget >/dev/null \
     && yum install -y python3 python3-devel \
     && pip3 install google protobuf setuptools wheel flask \
     && yum -y install epel-release && yum -y install patchelf libXext libSM libXrender\
-    && yum clean all
+    && yum clean all \
+    && echo "export LANG=en_US.utf8" >> /root/.bashrc