--- a/build/pymake/pymake/data.py
+++ b/build/pymake/pymake/data.py
@@ -35,17 +35,18 @@ def mtimeislater(deptime, targettime):
     """
     Is the mtime of the dependency later than the target?
     """
 
     if deptime is None:
         return True
     if targettime is None:
         return False
-    return deptime > targettime
+    # int(1000*x) because of http://bugs.python.org/issue10148
+    return int(1000 * deptime) > int(1000 * targettime)
 
 def getmtime(path):
     try:
         s = os.stat(path)
         return s.st_mtime
     except OSError:
         return None