diff --git a/ehyd_tools/design_rainfall.py b/ehyd_tools/design_rainfall.py
index 156354d..3151f0f 100644
--- a/ehyd_tools/design_rainfall.py
+++ b/ehyd_tools/design_rainfall.py
@@ -83,7 +83,7 @@ def table(self):
             # df = df.dropna(axis=0, how='all')
 
             # convert string column names to integers
-            df.columns = df.columns.str.replace('min', '').astype(int)
+            df.columns = df.columns.str.replace('T', '').astype(int)
             # df.columns.name = 'Jährlichkeit'
             df.columns.name = INDICES.RETURN_PERIOD