diff --git a/common.py b/common.py
index 01d2114a..a4bb8fbb 100644
--- a/common.py
+++ b/common.py
@@ -86,10 +86,10 @@ class vcs:
 class vcs_git(vcs):
 
     def checkrepo(self):
-        p = subprocess.Popen('git', 'rev-parse', '--show-toplevel',
-                stdout=subprocess.PIPE)
+        p = subprocess.Popen(['git', 'rev-parse', '--show-toplevel'],
+                stdout=subprocess.PIPE, cwd=self.local)
         result = p.communicate()[0].rstrip()
-        if not self.local.endswith(result):
+        if not result.endswith(self.local):
             raise VCSException('Repository mismatch')
 
     def clone(self):