diff --git a/setup.cfg b/setup.cfg
index 67c5d65..0b988c4 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = edge-tts
-version = 2.0.5
+version = 2.0.6
 author = rany
 author_email = ranygh@riseup.net
 description = Microsoft Edge's TTS
diff --git a/src/edgeTTS/__init__.py b/src/edgeTTS/__init__.py
index 7be4126..73e4313 100755
--- a/src/edgeTTS/__init__.py
+++ b/src/edgeTTS/__init__.py
@@ -49,9 +49,8 @@ def removeIncompatibleControlChars(s):
 def mktimestamp(ns):
     hour = math.floor(ns / 10000 / 1000 / 3600)
     minute = math.floor((ns / 10000 / 1000 / 60) % 60)
-    seconds = math.floor((ns / 10000 / 1000) % 60)
-    mili = float(str(math.modf((ns / 10000) - (1000 * seconds))[1])[:3])
-    return "%.02d:%.02d:%.02d.%.03d" % (hour, minute, seconds, mili)
+    seconds = (ns / 10000 / 1000) % 60
+    return "%.02d:%.02d:%06.3f" % (hour, minute, seconds)
 
 # Return loaded JSON data of list of Edge's voices
 # NOTE: It's not the total list of available voices.