--- a/hgext/convert/subversion.py
+++ b/hgext/convert/subversion.py
@@ -245,7 +245,7 @@ class convert_svn(converter_source):
                 strict_node_history]
         arg = encodeargs(args)
         hgexe = util.hgexecutable()
-        cmd = '"%s "debugsvnlog""' % util.shellquote(hgexe)
+        cmd = '%s debugsvnlog' % util.shellquote(hgexe)
         stdin, stdout = os.popen2(cmd, 'b')
 
         stdin.write(arg)