diff --git a/pkgs/by-name/fi/fityk/package.nix b/pkgs/by-name/fi/fityk/package.nix
index 115f23fedc6a..ff504c6f1145 100644
--- a/pkgs/by-name/fi/fityk/package.nix
+++ b/pkgs/by-name/fi/fityk/package.nix
@@ -2,10 +2,11 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch2,
   autoreconfHook,
   wxwidgets_3_2,
   boost186,
-  lua5_2_compat,
+  lua5_5,
   zlib,
   bzip2,
   xylib,
@@ -14,7 +15,7 @@
   swig,
 }:
 let
-  lua = lua5_2_compat;
+  lua = lua5_5;
 in
 
 stdenv.mkDerivation (finalAttrs: {
@@ -28,6 +29,16 @@ stdenv.mkDerivation (finalAttrs: {
     sha256 = "sha256-m2RaZMYT6JGwa3sOUVsBIzCdZetTbiygaInQWoJ4m1o=";
   };
 
+  patches = [
+    # Accept Lua 5.5 in configure (https://github.com/wojdyr/fityk/pull/64).
+    # Can be dropped at the next release.
+    (fetchpatch2 {
+      name = "fityk-detect-lua-5.5.patch";
+      url = "https://github.com/wojdyr/fityk/commit/48456231ca58211d7bcde0d2d8ac0c29cae2ab16.patch?full_index=1";
+      hash = "sha256-QkhNnGRuSP0bGqK7GtHfx2OpkEZoz8YI7M2m4f5N1Pw=";
+    })
+  ];
+
   nativeBuildInputs = [
     autoreconfHook
     lua