diff --git a/INSTALL.md b/INSTALL.md
index f1ddc43f8..35bdc91bd 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -16,7 +16,7 @@ There are no submodules. Dependencies are fairly minimal.
 
 Install build dependencies:
 
-`apt-get install build-essential cmake doctest-dev zlib1g-dev libavformat-dev libavutil-dev libgpm-dev libncurses-dev libqrcodegen-dev libswscale-dev libunistring-dev pandoc pkg-config`
+`apt-get install build-essential cmake doctest-dev zlib1g-dev libavformat-dev libavutil-dev libdeflate-dev libgpm-dev libncurses-dev libqrcodegen-dev libswscale-dev libunistring-dev pandoc pkg-config`
 
 If you only intend to build core Notcurses (without multimedia support), you
 can omit `libavformat-dev`, `libavutil-dev`, and `libswscale-dev` from this