diff --git a/lightrag/utils.py b/lightrag/utils.py
index bbafd9f1..87ccbea1 100644
--- a/lightrag/utils.py
+++ b/lightrag/utils.py
@@ -272,19 +272,26 @@ def compute_args_hash(*args: Any) -> str:
     Returns:
         str: Hash string
     """
-    import hashlib
-
     # Convert all arguments to strings and join them
     args_str = "".join([str(arg) for arg in args])
 
     # Use 'replace' error handling to safely encode problematic Unicode characters
     # This replaces invalid characters with Unicode replacement character (U+FFFD)
     try:
-        return hashlib.md5(args_str.encode("utf-8")).hexdigest()
+        return md5(args_str.encode("utf-8")).hexdigest()
     except UnicodeEncodeError:
         # Handle surrogate characters and other encoding issues
         safe_bytes = args_str.encode("utf-8", errors="replace")
-        return hashlib.md5(safe_bytes).hexdigest()
+        return md5(safe_bytes).hexdigest()
+
+
+def compute_mdhash_id(content: str, prefix: str = "") -> str:
+    """
+    Compute a unique ID for a given content string.
+
+    The ID is a combination of the given prefix and the MD5 hash of the content string.
+    """
+    return prefix + compute_args_hash(content)
 
 
 def generate_cache_key(mode: str, cache_type: str, hash_value: str) -> str:
@@ -316,15 +323,6 @@ def parse_cache_key(cache_key: str) -> tuple[str, str, str] | None:
     return None
 
 
-def compute_mdhash_id(content: str, prefix: str = "") -> str:
-    """
-    Compute a unique ID for a given content string.
-
-    The ID is a combination of the given prefix and the MD5 hash of the content string.
-    """
-    return prefix + md5(content.encode()).hexdigest()
-
-
 # Custom exception class
 class QueueFullError(Exception):
     """Raised when the queue is full and the wait times out"""