diff --git a/dlls/jscript/compile.c b/dlls/jscript/compile.c
index df3acb4b3b4..f96594862cd 100644
--- a/dlls/jscript/compile.c
+++ b/dlls/jscript/compile.c
@@ -518,7 +518,7 @@ static HRESULT compile_new_expression(compiler_ctx_t *ctx, call_expression_t *ex
         arg_cnt++;
     }
 
-    return push_instr_int(ctx, OP_new, arg_cnt);
+    return push_instr_uint(ctx, OP_new, arg_cnt);
 }
 
 static HRESULT compile_call_expression(compiler_ctx_t *ctx, call_expression_t *expr, BOOL *no_ret)
diff --git a/dlls/jscript/engine.c b/dlls/jscript/engine.c
index 983787b7e25..7d9b37a4a0e 100644
--- a/dlls/jscript/engine.c
+++ b/dlls/jscript/engine.c
@@ -987,7 +987,7 @@ static void jsstack_to_dp(exec_ctx_t *ctx, unsigned arg_cnt, DISPPARAMS *dp)
 /* ECMA-262 3rd Edition    11.2.2 */
 static HRESULT interp_new(exec_ctx_t *ctx)
 {
-    const LONG arg = get_op_int(ctx, 0);
+    const unsigned arg = get_op_uint(ctx, 0);
     VARIANT *constr, v;
     DISPPARAMS dp;
     HRESULT hres;
diff --git a/dlls/jscript/engine.h b/dlls/jscript/engine.h
index a842a35e8db..8c70783fab8 100644
--- a/dlls/jscript/engine.h
+++ b/dlls/jscript/engine.h
@@ -78,7 +78,7 @@ typedef struct {
     X(neg,        1, 0,0)                  \
     X(neq,        1, 0,0)                  \
     X(neq2,       1, 0,0)                  \
-    X(new,        1, ARG_INT,    0)        \
+    X(new,        1, ARG_UINT,   0)        \
     X(new_obj,    1, 0,0)                  \
     X(null,       1, 0,0)                  \
     X(obj_prop,   1, ARG_BSTR,   0)        \