diff --git a/astro/denoising/wavelet.py b/astro/denoising/wavelet.py
index 86af0a2..fa3ba7f 100644
--- a/astro/denoising/wavelet.py
+++ b/astro/denoising/wavelet.py
@@ -79,7 +79,7 @@ def decompose(data, n_scales=4):
     trans.data = data
     trans.analysis()
 
-    res = np.array(trans.analysis_data, dtype=np.float)
+    res = np.array(trans.analysis_data, dtype=np.float64)
 
     return res