diff --git a/doc/build-unix.md b/doc/build-unix.md
index 56054456..8a76a8b2 100644
--- a/doc/build-unix.md
+++ b/doc/build-unix.md
@@ -109,7 +109,7 @@ 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: