diff --git a/constrain/libcases.py b/constrain/libcases.py
index 3ce0d12..62d0df2 100644
--- a/constrain/libcases.py
+++ b/constrain/libcases.py
@@ -40,8 +40,11 @@ def run_libcase(
     run_idf_path = None
     idd_path = None
     run_path = None
-    if need_injection:
+
+    if need_injection or run_sim:
         original_idf_path = item.item["simulation_IO"]["idf"].strip()
+
+    if need_injection:
         idd_path = item.item["simulation_IO"]["idd"].strip()
         if ".idf" in original_idf_path.lower():
             run_path = f"{original_idf_path[:-4]}"