diff --git a/lib/spack/spack/build_systems/r.py b/lib/spack/spack/build_systems/r.py
index d88bf491232..75956c4a8aa 100644
--- a/lib/spack/spack/build_systems/r.py
+++ b/lib/spack/spack/build_systems/r.py
@@ -7,11 +7,11 @@
 import llnl.util.filesystem as fs
 import llnl.util.lang as lang
 import llnl.util.tty as tty
-import spack.builder
-import spack.deptypes as dt
 from llnl.util.filesystem import mkdirp
 from llnl.util.lang import ClassProperty, classproperty
 
+import spack.builder
+import spack.deptypes as dt
 from spack.dependency import Dependency
 from spack.directives import extends
 from spack.error import SpackError
@@ -70,7 +70,6 @@ def append(field_value: Union[bytes, str]):
         # in our dictionary we have a single package
         # metadata parsed so we yield and repeat again.
         for line in data.splitlines():
-
             if not line.strip():
                 continue
 
@@ -106,7 +105,6 @@ def append(field_value: Union[bytes, str]):
         if package:
             yield package
 
-
     def verify_package(self):
         if not self.pkg.run_tests:
             return