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-rw-r--r--numpy/fft/fftpack.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/numpy/fft/fftpack.py b/numpy/fft/fftpack.py
index 2f19ba3d8..80d21ec1d 100644
--- a/numpy/fft/fftpack.py
+++ b/numpy/fft/fftpack.py
@@ -511,7 +511,7 @@ def _cook_nd_args(a, s=None, axes=None, invreal=0):
if len(s) != len(axes):
raise ValueError("Shape and axes have different lengths.")
if invreal and shapeless:
- s[axes[-1]] = (s[axes[-1]] - 1) * 2
+ s[-1] = (a.shape[axes[-1]] - 1) * 2
return s, axes