diff --git a/src/interpreter.cc b/src/interpreter.cc
index 898a543..45bced9 100644
--- a/src/interpreter.cc
+++ b/src/interpreter.cc
@@ -2596,9 +2596,6 @@ void _interpret(Program* program, int a2)
             programFatalError(err);
         }
 
-        // Reset argument counter for error reporting.
-        program->arg = 0;
-
         handler(program);
     }
 
diff --git a/src/interpreter.h b/src/interpreter.h
index fd91397..87f7c74 100644
--- a/src/interpreter.h
+++ b/src/interpreter.h
@@ -171,7 +171,6 @@ typedef struct Program {
     bool exited;
     ProgramStack* stackValues;
     ProgramStack* returnStackValues;
-    int arg;
 } Program;
 
 typedef void OpcodeHandler(Program* program);