diff --git a/dlls/jscript/engine.c b/dlls/jscript/engine.c
index e554dd89851..9b6ace9dc2f 100644
--- a/dlls/jscript/engine.c
+++ b/dlls/jscript/engine.c
@@ -1502,10 +1502,32 @@ HRESULT add_expression_eval(exec_ctx_t *ctx, expression_t *_expr, DWORD flags, j
     return binary_expr_eval(ctx, expr, add_eval, ei, ret);
 }
 
-HRESULT sub_expression_eval(exec_ctx_t *ctx, expression_t *expr, DWORD flags, jsexcept_t *ei, exprval_t *ret)
+/* ECMA-262 3rd Edition    11.6.2 */
+static HRESULT sub_eval(exec_ctx_t *ctx, VARIANT *lval, VARIANT *rval, jsexcept_t *ei, VARIANT *retv)
 {
-    FIXME("\n");
-    return E_NOTIMPL;
+    VARIANT lnum, rnum;
+    HRESULT hres;
+
+    hres = to_number(ctx->parser->script, lval, ei, &lnum);
+    if(FAILED(hres))
+        return hres;
+
+    hres = to_number(ctx->parser->script, rval, ei, &rnum);
+    if(FAILED(hres))
+        return hres;
+
+    num_set_val(retv, num_val(&lnum) - num_val(&rnum));
+    return S_OK;
+}
+
+/* ECMA-262 3rd Edition    11.6.2 */
+HRESULT sub_expression_eval(exec_ctx_t *ctx, expression_t *_expr, DWORD flags, jsexcept_t *ei, exprval_t *ret)
+{
+    binary_expression_t *expr = (binary_expression_t*)_expr;
+
+    TRACE("\n");
+
+    return binary_expr_eval(ctx, expr, sub_eval, ei, ret);
 }
 
 HRESULT mul_expression_eval(exec_ctx_t *ctx, expression_t *expr, DWORD flags, jsexcept_t *ei, exprval_t *ret)
diff --git a/dlls/jscript/tests/lang.js b/dlls/jscript/tests/lang.js
index e099df99aa6..96df5171389 100644
--- a/dlls/jscript/tests/lang.js
+++ b/dlls/jscript/tests/lang.js
@@ -173,6 +173,14 @@ tmp = 1.5+2.5;
 ok(tmp === 4, "1.4+2.5 !== 4");
 ok(getVT(tmp) === "VT_I4", "getVT(1.5+2.5) !== VT_I4");
 
+tmp = 4-2;
+ok(tmp === 2, "4-2 !== 2");
+ok(getVT(tmp) === "VT_I4", "getVT(4-2) !== VT_I4");
+
+tmp = 4.5-2;
+ok(tmp === 2.5, "4.5-2 !== 2.5");
+ok(getVT(tmp) === "VT_R8", "getVT(4-2) !== VT_R8");
+
 tmp = "ab" + "cd";
 ok(tmp === "abcd", "\"ab\" + \"cd\" !== \"abcd\"");