diff --git a/doc/build-unix.md b/doc/build-unix.md
index d08c327ff..d5ddc90d4 100644
--- a/doc/build-unix.md
+++ b/doc/build-unix.md
@@ -111,7 +111,7 @@ To build with Qt 4 you need the following:
 
 For Qt 5 you need the following:
 
-    sudo apt-get install libqt5gui5 libqt5core5 libqt5dbus5 qttools5-dev qttools5-dev-tools libprotobuf-dev
+    sudo apt-get install libqt5gui5 libqt5core5 libqt5dbus5 qttools5-dev qttools5-dev-tools libprotobuf-dev protobuf-compiler
 
 libqrencode (optional) can be installed with: