diff --git a/nixos/tests/plasma5.nix b/nixos/tests/plasma5.nix
index f561fc8c3c4c..f97544b5ea52 100644
--- a/nixos/tests/plasma5.nix
+++ b/nixos/tests/plasma5.nix
@@ -13,6 +13,21 @@ import ./make-test.nix ({ pkgs, ...} :
     services.xserver.desktopManager.plasma5.enable = true;
     services.xserver.desktopManager.default = "plasma5";
     virtualisation.memorySize = 1024;
+
+    # fontconfig-penultimate-0.3.3 -> 0.3.4 broke OCR apparently, but no idea why.
+    nixpkgs.config.packageOverrides = superPkgs: {
+      fontconfig-penultimate = superPkgs.fontconfig-penultimate.overrideAttrs
+        (_attrs: rec {
+          version = "0.3.3";
+          name = "fontconfig-penultimate-${version}";
+          src = pkgs.fetchFromGitHub {
+            owner = "ttuegel";
+            repo = "fontconfig-penultimate";
+            rev = version;
+            sha256 = "0392lw31jps652dcjazln77ihb6bl7gk201gb7wb9i223avp86w9";
+          };
+        });
+    };
   };
 
   enableOCR = true;