diff --git a/var/spack/repos/builtin/packages/foam-extend/package.py b/var/spack/repos/builtin/packages/foam-extend/package.py
index 4bbb065d8bd..71a61afaa6a 100644
--- a/var/spack/repos/builtin/packages/foam-extend/package.py
+++ b/var/spack/repos/builtin/packages/foam-extend/package.py
@@ -99,9 +99,10 @@ def patch(self):
             filter_file(r'-lIMlib -lMGridGen',
                         r'-limlib -lmgrid',
                         'src/dbns/Make/options')
-            filter_file(r'-lMGridGen',
-                        r'-lmgrid',
-                        'src/fvAgglomerationMethods/MGridGenGamgAgglomeration/Make/options')
+            filter_file(
+                r'-lMGridGen',
+                r'-lmgrid',
+                'src/fvAgglomerationMethods/MGridGenGamgAgglomeration/Make/options')  # NOQA: ignore=501
 
         (arch, foam_compiler) = self.set_arch()