diff --git a/audio_data.py b/audio_data.py
index 1489b859d..e79ca35be 100644
--- a/audio_data.py
+++ b/audio_data.py
@@ -193,7 +193,7 @@ def conditioning(self, file_index, position_in_file, item_length):
         offset = position_in_file % self.conditioning_period
         conditioning_count = math.ceil(item_length / self.conditioning_period) + 1
 
-        sample_to_phase = (2*math.pi) / (self.sampling_rate * self.min_conditioning_breadth)
+        sample_to_phase = (math.pi) / (self.sampling_rate * self.min_conditioning_breadth)
         phase_start = (position_in_file - offset) * sample_to_phase
         phase_length = conditioning_count * self.conditioning_period * sample_to_phase
         x = np.linspace(phase_start, phase_start + phase_length, num=conditioning_count)