diff --git a/pkgs/development/python-modules/cftime/default.nix b/pkgs/development/python-modules/cftime/default.nix
index 865282cfa650..c925381d00f1 100644
--- a/pkgs/development/python-modules/cftime/default.nix
+++ b/pkgs/development/python-modules/cftime/default.nix
@@ -2,6 +2,7 @@
 , buildPythonPackage
 , cython
 , fetchPypi
+, fetchpatch
 , numpy
 , pytestCheckHook
 , pythonOlder
@@ -16,9 +17,22 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-hhTAD7ilBG3jBP3Ybb0iT5lAgYXXskWsZijQJ2WW5tI=";
+    hash = "sha256-hhTAD7ilBG3jBP3Ybb0iT5lAgYXXskWsZijQJ2WW5tI=";
   };
 
+  patches = [
+    (fetchpatch {
+      # Fix test_num2date_precision by checking per platform precision
+      url = "https://github.com/Unidata/cftime/commit/221ff2195d588a43a7984597033b678f330fbc41.patch";
+      hash = "sha256-3XTJuET20g9QElM/8WGnNzJBFZ0oUN4ikhWKppwcyNM=";
+    })
+  ];
+
+  postPatch = ''
+    sed -i "/--cov/d" setup.cfg
+  '';
+
+
   nativeBuildInputs = [
     cython
     numpy
@@ -32,10 +46,6 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
-  postPatch = ''
-    sed -i "/--cov/d" setup.cfg
-  '';
-
   pythonImportsCheck = [
     "cftime"
   ];