diff --git a/propti/data_structures.py b/propti/data_structures.py
index cb9327a..66e7f57 100644
--- a/propti/data_structures.py
+++ b/propti/data_structures.py
@@ -447,6 +447,8 @@ def read_data(self, wd: os.path, target: str = 'model'):
         in_file = os.path.join(wd, ds.file_name)
         # Read data as Pandas DataFrame.
         data = pd.read_csv(in_file, header=ds.header_line)
+        # Get rid of unwanted spaces.
+        data = data.rename(columns=lambda x: x.strip())
 
         # Get all header labels from the data frame.
         headers = list(data)