diff --git a/vm.py b/vm.py
index 7c7c03b..f7d78c5 100644
--- a/vm.py
+++ b/vm.py
@@ -70,7 +70,7 @@ class Vm(TPrs):
                 elif callable(instr):
                     synt = instr(self)
                     if synt != None:
-                        (r, ip) = self.CallI(instr, r, ip)
+                        (r, ip) = self.CallI(synt, r, ip)
                 else:
                     assert False, "invalid instr " + str(instr)
             else: