diff --git a/src/sakia/core/money/quantitative.py b/src/sakia/core/money/quantitative.py
index e2726565ba42942971a58c0c334db34a53c36b90..aa4808e39ce6108a770681ba55d1984246800645 100644
--- a/src/sakia/core/money/quantitative.py
+++ b/src/sakia/core/money/quantitative.py
@@ -54,7 +54,7 @@ class Quantitative(BaseReferential):
 
     @staticmethod
     def to_si(value, digits):
-        prefixes = ['', 'k', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y', 'z', 'y']
+        prefixes = ['', 'k', 'M', 'G', 'Tera', 'Peta', 'Exa', 'Zeta', 'Yotta']
         if value < 0:
             value = -value
             multiplier = -1