diff --git a/tests/dummyssh b/tests/dummyssh
--- a/tests/dummyssh
+++ b/tests/dummyssh
@@ -16,5 +16,9 @@ for i, arg in enumerate(sys.argv[1:]):
     log.write(" %d:%s" % (i+1, arg))
 log.write("\n")
 log.close()
-r = os.system(sys.argv[2])
+hgcmd = sys.argv[2]
+if os.name == 'nt':
+    # hack to make simple unix single quote quoting work on windows
+    hgcmd = hgcmd.replace("'", '"')
+r = os.system(hgcmd)
 sys.exit(bool(r))