diff --git a/BUILDING.md b/BUILDING.md
index e4269a25956..f730e0a2ccd 100644
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -12,7 +12,7 @@ gRPC C++ - Building from source
 If you plan to build from source and run tests, install the following as well:
 ```sh
  $ [sudo] apt-get install libgflags-dev libgtest-dev
- $ [sudo] apt-get install clang libc++-dev
+ $ [sudo] apt-get install clang-5.0 libc++-dev
 ```
 Lastly, see the Protoc section below if you do not yet have the protoc compiler installed.