diff --git a/lib/matplotlib/mlab.py b/lib/matplotlib/mlab.py
index 5e85a9c1194f..921eff1c0222 100644
--- a/lib/matplotlib/mlab.py
+++ b/lib/matplotlib/mlab.py
@@ -395,7 +395,11 @@ def _spectral_helper(x, y=None, NFFT=None, Fs=None, detrend_func=None,
elif mode == 'psd':
result = np.conj(result) * result
elif mode == 'magnitude':
- result = np.abs(result) / np.abs(window).sum()
+ result = np.abs(result)
+ if np.iscomplexobj(window):
+ result /= np.abs(window).sum()
+ else:
+ result /= np.asarray(window).sum()
elif mode == 'angle' or mode == 'phase':
# we unwrap the phase later to handle the onesided vs. twosided case
result = np.angle(result)
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