diff --git a/python/tools/thor.py b/python/tools/thor.py
index b3c6eef..770242a 100644
--- a/python/tools/thor.py
+++ b/python/tools/thor.py
@@ -581,7 +581,7 @@ def _usrp_setup(self):
         # (integer division of clock rate)
         cr = op.clock_rates[0]
         srdec = int(round(cr / samplerate))
-        op.samplerate_frac = Fraction(cr).limit_denominator(2 ** 32) / srdec
+        op.samplerate_frac = Fraction(cr).limit_denominator(2**32) / srdec
         samplerate_ld = np.longdouble(cr) / srdec
         op.samplerate = samplerate_ld
 
@@ -727,7 +727,7 @@ def _finalize_options(self):
             if osr is None:
                 ratio = Fraction(1)
             else:
-                ratio = (Fraction(osr) / op.samplerate_frac).limit_denominator(2 ** 16)
+                ratio = (Fraction(osr) / op.samplerate_frac).limit_denominator(2**16)
             op.resampling_ratios.append(ratio)
 
             # get output samplerate fraction