diff --git a/Lib/whichdb.py b/Lib/whichdb.py
index 3722e41..8985062 100644
--- a/Lib/whichdb.py
+++ b/Lib/whichdb.py
@@ -41,12 +41,9 @@
 
     # Convert to 4-byte int in native byte order -- return "" if impossible
     try:
-	(magic,) = struct.unpack("l", s)
+	(magic,) = struct.unpack("=l", s)
     except struct.error:
-	try:
-	    (magic,) = struct.unpack("i", s)
-	except struct.error:
-	    return ""
+	return ""
 
     # Check for GNU dbm
     if magic == 0x13579ace: