diff --git a/src/fosslight_oss_pkg/_parsing_excel.py b/src/fosslight_oss_pkg/_parsing_excel.py
index 0fd2d8d..4e63633 100644
--- a/src/fosslight_oss_pkg/_parsing_excel.py
+++ b/src/fosslight_oss_pkg/_parsing_excel.py
@@ -22,7 +22,7 @@ def get_sheet_name(yaml_file, sheet_list):
         yaml_file = yaml_file[0:MAX_SHEET_NAME_LEN]
 
     count = 1
-    while yaml_file in sheet_list:
+    while yaml_file in sheet_list.keys():
         end_idx = MAX_SHEET_NAME_LEN - 1 - len(str(count))
         yaml_file = f"{yaml_file[0:end_idx]}_{count}"
         count += 1