diff --git a/waveform/wrapper_mpv_waveform/mpvwaveform.py b/waveform/wrapper_mpv_waveform/mpvwaveform.py
index 256b185ba413941d898645ec27f40d11e0ca9e3c..8f9664abf08a9bd4c7e03dfef4cfff9e1eeba5e8 100644
--- a/waveform/wrapper_mpv_waveform/mpvwaveform.py
+++ b/waveform/wrapper_mpv_waveform/mpvwaveform.py
@@ -24,7 +24,7 @@ def gen(**kwds):
 
     hp, hc = get_fd_waveform(approximant=kwds['baseapprox'], **kwds)
     zz = cosmology.redshift(kwds['distance'])
-    intz = integrate.quad(integrand_parityamu_mpv 0, zz)[0]
+    intz = integrate.quad(integrand_parityamu_mpv, 0, zz)[0]
     temp =  kwds['parity_mpvinverse'] * intz / 1e9 / lal.QE_SI * lal.H_SI * lal.PI * lal.PI / lal.H0_SI
 
     hp_parity = hp + hc * temp * hp.sample_frequencies **2