diff --git a/watpy/wave/wave.py b/watpy/wave/wave.py
index b009c87700bfef5f1a601c0184681e753d076e79..5a702cce9cfeb5edc1f2d5441f1691ffbe89bad6 100644
--- a/watpy/wave/wave.py
+++ b/watpy/wave/wave.py
@@ -127,7 +127,7 @@ def wfile_get_mass(fname):
     fname  : Name of the file to parse for information
     """
     s = extract_comments(fname, '#')
-    return float(re.findall("\d+\.\d+",s[1])[0])
+    return float(s[1].split("=")[1])
 
 
 # BAM specials