diff --git a/src/backend/jit/llvm/llvmjit_expr.c b/src/backend/jit/llvm/llvmjit_expr.c
index 075ee76310e..f69780a5d7a 100644
--- a/src/backend/jit/llvm/llvmjit_expr.c
+++ b/src/backend/jit/llvm/llvmjit_expr.c
@@ -1154,7 +1154,7 @@ llvm_compile_expr(ExprState *state)
 										 llvm_pg_var_type("TypeExecEvalSubroutine"));
 
 					v_params[0] = v_state;
-					v_params[1] = l_ptr_const(op, l_ptr(TypeSizeT));
+					v_params[1] = l_ptr_const(op, l_ptr(StructExprEvalStep));
 					v_params[2] = v_econtext;
 					l_call(b,
 						   LLVMGetFunctionType(ExecEvalSubroutineTemplate),