diff --git a/src/imf_reader/weo/parser.py b/src/imf_reader/weo/parser.py
index e9c12df..f04c2ff 100644
--- a/src/imf_reader/weo/parser.py
+++ b/src/imf_reader/weo/parser.py
@@ -127,7 +127,7 @@ def clean_numeric_columns(df: pd.DataFrame) -> pd.DataFrame:
         """
 
         for column, dtype in SDMX_NUMERIC_COLUMNS.items():
-            df[column] = df[column].replace(["n/a", "--", "NULL", ''], pd.NA)
+            df[column] = df[column].replace(["n/a", "--", "NULL", ""], pd.NA)
             df[column] = df[column].str.replace(",", "")  # Remove commas
             df[column] = df[column].astype(dtype)