diff --git a/tests/system-test/2-query/length.py b/tests/system-test/2-query/length.py
index 2bf3f22b567e2119a1876045c47e160735b15bc2..b9ad6b9944f38794e38c968ff726a5e5e73e7406 100644
--- a/tests/system-test/2-query/length.py
+++ b/tests/system-test/2-query/length.py
@@ -66,7 +66,7 @@ class TDTestCase:
                 for data in datas :
                     if not datas:
                         length_data.append(None)
-                    elif "nchar" in length_condition or NCHAR_COL in length_condition:
+                    elif "nchar" in condition or NCHAR_COL in condition:
                         length_data.append(len(str(data)) * 4)
                     else:
                         length_data.append(len(str(data)))