diff --git a/dlls/jscript/engine.c b/dlls/jscript/engine.c
index 2a37d058b8e..36286da5b3e 100644
--- a/dlls/jscript/engine.c
+++ b/dlls/jscript/engine.c
@@ -641,16 +641,58 @@ HRESULT if_statement_eval(exec_ctx_t *ctx, statement_t *_stat, return_type_t *rt
     return hres;
 }
 
-HRESULT dowhile_statement_eval(exec_ctx_t *ctx, statement_t *stat, return_type_t *rt, VARIANT *ret)
+/* ECMA-262 3rd Edition    12.6.2 */
+HRESULT while_statement_eval(exec_ctx_t *ctx, statement_t *_stat, return_type_t *rt, VARIANT *ret)
 {
-    FIXME("\n");
-    return E_NOTIMPL;
-}
+    while_statement_t *stat = (while_statement_t*)_stat;
+    exprval_t exprval;
+    VARIANT val, tmp;
+    VARIANT_BOOL b;
+    BOOL test_expr;
+    HRESULT hres;
 
-HRESULT while_statement_eval(exec_ctx_t *ctx, statement_t *stat, return_type_t *rt, VARIANT *ret)
-{
-    FIXME("\n");
-    return E_NOTIMPL;
+    TRACE("\n");
+
+    V_VT(&val) = VT_EMPTY;
+    test_expr = !stat->do_while;
+
+    while(1) {
+        if(test_expr) {
+            hres = expr_eval(ctx, stat->expr, 0, &rt->ei, &exprval);
+            if(FAILED(hres))
+                break;
+
+            hres = exprval_to_boolean(ctx->parser->script, &exprval, &rt->ei, &b);
+            exprval_release(&exprval);
+            if(FAILED(hres) || !b)
+                break;
+        }else {
+            test_expr = TRUE;
+        }
+
+        hres = stat_eval(ctx, stat->statement, rt, &tmp);
+        if(FAILED(hres))
+            break;
+
+        VariantClear(&val);
+        val = tmp;
+
+        if(rt->type == RT_CONTINUE)
+            rt->type = RT_NORMAL;
+        if(rt->type != RT_NORMAL)
+            break;
+    }
+
+    if(FAILED(hres)) {
+        VariantClear(&val);
+        return hres;
+    }
+
+    if(rt->type == RT_BREAK)
+        rt->type = RT_NORMAL;
+
+    *ret = val;
+    return S_OK;
 }
 
 HRESULT for_statement_eval(exec_ctx_t *ctx, statement_t *stat, return_type_t *rt, VARIANT *ret)
diff --git a/dlls/jscript/engine.h b/dlls/jscript/engine.h
index 5c64853c99a..3f7fda86c9a 100644
--- a/dlls/jscript/engine.h
+++ b/dlls/jscript/engine.h
@@ -161,6 +161,7 @@ typedef struct {
 
 typedef struct {
     statement_t stat;
+    BOOL do_while;
     expression_t *expr;
     statement_t *statement;
 } while_statement_t;
@@ -229,7 +230,6 @@ HRESULT var_statement_eval(exec_ctx_t*,statement_t*,return_type_t*,VARIANT*);
 HRESULT empty_statement_eval(exec_ctx_t*,statement_t*,return_type_t*,VARIANT*);
 HRESULT expression_statement_eval(exec_ctx_t*,statement_t*,return_type_t*,VARIANT*);
 HRESULT if_statement_eval(exec_ctx_t*,statement_t*,return_type_t*,VARIANT*);
-HRESULT dowhile_statement_eval(exec_ctx_t*,statement_t*,return_type_t*,VARIANT*);
 HRESULT while_statement_eval(exec_ctx_t*,statement_t*,return_type_t*,VARIANT*);
 HRESULT for_statement_eval(exec_ctx_t*,statement_t*,return_type_t*,VARIANT*);
 HRESULT forin_statement_eval(exec_ctx_t*,statement_t*,return_type_t*,VARIANT*);
diff --git a/dlls/jscript/parser.y b/dlls/jscript/parser.y
index d8b876edfde..a6cb5ebf32c 100644
--- a/dlls/jscript/parser.y
+++ b/dlls/jscript/parser.y
@@ -1086,8 +1086,9 @@ static statement_t *new_while_statement(parser_ctx_t *ctx, BOOL dowhile, express
 {
     while_statement_t *ret = parser_alloc(ctx, sizeof(while_statement_t));
 
-    ret->stat.eval = dowhile ? dowhile_statement_eval : while_statement_eval;
+    ret->stat.eval = while_statement_eval;
     ret->stat.next = NULL;
+    ret->do_while = dowhile;
     ret->expr = expr;
     ret->statement = stat;
 
diff --git a/dlls/jscript/tests/lang.js b/dlls/jscript/tests/lang.js
index e2b5800ef61..6acc82c5e55 100644
--- a/dlls/jscript/tests/lang.js
+++ b/dlls/jscript/tests/lang.js
@@ -550,4 +550,36 @@ ok(tmp["3"] === 2, "tmp[3] !== 2");
 ok(tmp["6"] === true, "tmp[6] !== true");
 ok(tmp[2] === 1, "tmp[2] !== 1");
 
+tmp = 0;
+while(tmp < 4) {
+    ok(tmp < 4, "tmp >= 4");
+    tmp++;
+}
+ok(tmp === 4, "tmp !== 4");
+
+tmp = 0;
+while(true) {
+    ok(tmp < 4, "tmp >= 4");
+    tmp++;
+    if(tmp === 4) {
+        break;
+        ok(false, "break did not break");
+    }
+}
+ok(tmp === 4, "tmp !== 4");
+
+tmp = 0;
+do {
+    ok(tmp < 4, "tmp >= 4");
+    tmp++;
+} while(tmp < 4);
+ok(tmp === 4, "tmp !== 4");
+
+tmp = 0;
+do {
+    ok(tmp === 0, "tmp !=== 0");
+    tmp++;
+} while(false);
+ok(tmp === 1, "tmp !== 4");
+
 reportSuccess();