diff --git a/tests/test-debugcommands.t b/tests/test-debugcommands.t
--- a/tests/test-debugcommands.t
+++ b/tests/test-debugcommands.t
@@ -193,7 +193,8 @@ debugdelta chain basic output
    {
     "chainid": 1,
     "chainlen": 1,
-    "chainratio": 1.02325581395,
+    "chainratio": 1.02325581395, (no-py3k !)
+    "chainratio": 1.0232558139534884, (py3k !)
     "chainsize": 44,
     "compsize": 44,
     "deltatype": "base",
@@ -221,7 +222,8 @@ debugdelta chain basic output
    {
     "chainid": 3,
     "chainlen": 1,
-    "chainratio": 1.02325581395,
+    "chainratio": 1.02325581395, (no-py3k !)
+    "chainratio": 1.0232558139534884, (py3k !)
     "chainsize": 44,
     "compsize": 44,
     "deltatype": "base",
@@ -256,7 +258,8 @@ debugdelta chain with sparse read enable
    {
     "chainid": 1,
     "chainlen": 1,
-    "chainratio": 1.02325581395,
+    "chainratio": 1.02325581395, (no-py3k !)
+    "chainratio": 1.0232558139534884, (py3k !)
     "chainsize": 44,
     "compsize": 44,
     "deltatype": "base",
@@ -292,7 +295,8 @@ debugdelta chain with sparse read enable
    {
     "chainid": 3,
     "chainlen": 1,
-    "chainratio": 1.02325581395,
+    "chainratio": 1.02325581395, (no-py3k !)
+    "chainratio": 1.0232558139534884, (py3k !)
     "chainsize": 44,
     "compsize": 44,
     "deltatype": "base",