diff --git a/weldx/asdf/file.py b/weldx/asdf/file.py
index 831dc4ace..decc873ac 100644
--- a/weldx/asdf/file.py
+++ b/weldx/asdf/file.py
@@ -50,10 +50,10 @@
 
 
 def asdf_open_memory_mapping_kwarg(memmap: bool) -> dict:
-    if tuple(int(part) for part in importlib.metadata.version("asdf").split(".")) >= (
-        3,
-        1,
-        0,
+    if tuple(importlib.metadata.version("asdf").split(".")) >= (
+        "3",
+        "1",
+        "0",
     ):
         return {"memmap": memmap}
     else:
diff --git a/weldx/asdf/util.py b/weldx/asdf/util.py
index afde0f28b..9da1d5412 100644
--- a/weldx/asdf/util.py
+++ b/weldx/asdf/util.py
@@ -162,8 +162,8 @@ def read_buffer_context(
         open_kwargs = {"memmap": False, "lazy_load": False}
 
     if "memmap" in open_kwargs and tuple(
-        int(part) for part in importlib.metadata.version("asdf").split(".")
-    ) < (3, 1, 0):
+        importlib.metadata.version("asdf").split(".")
+    ) < ("3", "1", "0"):
         open_kwargs["copy_arrays"] = not open_kwargs["memmap"]
         del open_kwargs["memmap"]