diff --git a/tools/dockerfile/grpc_clang_format/Dockerfile b/tools/dockerfile/grpc_clang_format/Dockerfile
index 41239e9c23b3ceb615504b229ab3d3e8804f5bf0..ab58017a02af8937b6b1c393e16032c6250618b6 100644
--- a/tools/dockerfile/grpc_clang_format/Dockerfile
+++ b/tools/dockerfile/grpc_clang_format/Dockerfile
@@ -30,8 +30,8 @@
 FROM ubuntu:wily
 RUN apt-get update
 RUN apt-get -y install wget
-RUN echo deb http://llvm.org/apt/wily/ llvm-toolchain-wily main >> /etc/apt/sources.list
-RUN echo deb-src http://llvm.org/apt/wily/ llvm-toolchain-wily main >> /etc/apt/sources.list
+RUN echo deb http://llvm.org/apt/wily/ llvm-toolchain-wily-3.8 main >> /etc/apt/sources.list
+RUN echo deb-src http://llvm.org/apt/wily/ llvm-toolchain-wily-3.8 main >> /etc/apt/sources.list
 RUN wget -O - http://llvm.org/apt/llvm-snapshot.gpg.key| apt-key add -
 RUN apt-get update
 RUN apt-get -y install clang-format-3.8