diff --git a/pymake/implicit.py b/pymake/implicit.py
index d73895c..85e9ee0 100644
--- a/pymake/implicit.py
+++ b/pymake/implicit.py
@@ -1,14 +1,14 @@
-"""
-Implicit variables; perhaps in the future this will also include some implicit
-rules, at least match-anything cancellation rules.
-"""
-
-variables = {
-    'MKDIR': '%pymake.builtins mkdir',
-    'RM': '%pymake.builtins rm -f',
-    'SLEEP': '%pymake.builtins sleep',
-    'TOUCH': '%pymake.builtins touch',
-    '.LIBPATTERNS': 'lib%.so lib%.a',
-    '.PYMAKE': '1',
-    }
-
+"""
+Implicit variables; perhaps in the future this will also include some implicit
+rules, at least match-anything cancellation rules.
+"""
+
+variables = {
+    'MKDIR': '%pymake.builtins mkdir',
+    'RM': '%pymake.builtins rm -f',
+    'SLEEP': '%pymake.builtins sleep',
+    'TOUCH': '%pymake.builtins touch',
+    '.LIBPATTERNS': 'lib%.so lib%.a',
+    '.PYMAKE': '1',
+    }
+