diff --git a/pkgs/development/python-modules/pyoprf/default.nix b/pkgs/development/python-modules/pyoprf/default.nix
index f7f525034e79..55e4a25cb672 100644
--- a/pkgs/development/python-modules/pyoprf/default.nix
+++ b/pkgs/development/python-modules/pyoprf/default.nix
@@ -29,6 +29,9 @@ buildPythonPackage rec {
     ''
       substituteInPlace ./pyoprf/__init__.py --replace-fail \
         "ctypes.util.find_library('oprf') or ctypes.util.find_library('liboprf')" "'${lib.getLib liboprf}/lib/liboprf${soext}'"
+      substituteInPlace pyoprf/noisexk.py \
+        --replace-fail "ctypes.util.find_library('oprf-noiseXK')" "'${lib.getLib liboprf}/lib/liboprf-noiseXK${soext}'" \
+        --replace-fail "or ctypes.util.find_library('liboprf-noiseXK')" ""
     '';
 
   sourceRoot = "${src.name}/python";