diff --git a/pelican/tools/pelican_themes.py b/pelican/tools/pelican_themes.py
index 6a021ecc..0083dd50 100755
--- a/pelican/tools/pelican_themes.py
+++ b/pelican/tools/pelican_themes.py
@@ -180,8 +180,19 @@ def install(path, v=False, u=False):
                 print("Copying `{p}' to `{t}' ...".format(p=path, t=theme_path))
             try:
                 shutil.copytree(path, theme_path)
-            except Exception, e:
+
+                if os.name == 'posix':
+                    for root, dirs, files in os.walk(theme_path):
+                        for d in dirs:
+                            dname = os.path.join(root, d)
+                            os.chmod(dname, 0755)
+                        for f in files:
+                            fname = os.path.join(root, f)
+                            os.chmod(fname, 0644)
+            except shutil.Error, e:
                 err("Cannot copy `{p}' to `{t}':\n{e}".format(p=path, t=theme_path, e=str(e)))
+            except OSError, e:
+                err("Cannot change permissions of files or directory in `{r}':\n{e}".format(r=theme_path, e=str(e)), die=False)
 
 
 def symlink(path, v=False):