diff --git a/Building.md b/Building.md
index fbfa33f..4f0629d 100644
--- a/Building.md
+++ b/Building.md
@@ -31,7 +31,7 @@ pacman -Su git wget make tar unzip zip mingw-w64-x86_64-gcc mingw-w64-x86_64-gdb
 
 On Ubuntu 16.04+:
 ```bash
-sudo apt install git gdb curl cmake libx11-dev libglu1-mesa-dev libxrandr-dev libxinerama-dev libxcursor-dev libxi-dev zlib1g-dev libasound2-dev libgtk2.0-dev libjack-jackd2-dev jq
+sudo apt install git gdb curl cmake libx11-dev libglu1-mesa-dev libxrandr-dev libxinerama-dev libxcursor-dev libxi-dev zlib1g-dev libasound2-dev libgtk2.0-dev libjack-jackd2-dev jq libgtk-3-dev
 ```
 
 On Arch Linux: