diff --git a/src/mudlib/zmachine/zcpu.py b/src/mudlib/zmachine/zcpu.py
index ec26f97..e7882fa 100644
--- a/src/mudlib/zmachine/zcpu.py
+++ b/src/mudlib/zmachine/zcpu.py
@@ -251,17 +251,14 @@ class ZCpu:
         # Fallthrough: No args were equal to a.
         self._branch(False)
 
-    def op_jl(self, a, *others):
-        """Branch if the first argument is less than any subsequent
-        argument. Note that the second operand may be absent, in
-        which case there is no jump."""
-        for b in others:
-            if a < b:
-                self._branch(True)
-                return
-
-        # Fallthrough: No args were greater than a.
-        self._branch(False)
+    def op_jl(self, a, b):
+        """Branch if the first argument is less than the second."""
+        a = self._make_signed(a)
+        b = self._make_signed(b)
+        if a < b:
+            self._branch(True)
+        else:
+            self._branch(False)
 
     def op_jg(self, a, b):
         """Branch if the first argument is greater than the second."""