diff --git a/dlls/msvcirt/msvcirt.c b/dlls/msvcirt/msvcirt.c
index 04c195d090b..c7400497d14 100644
--- a/dlls/msvcirt/msvcirt.c
+++ b/dlls/msvcirt/msvcirt.c
@@ -172,6 +172,8 @@ streambuf* __thiscall streambuf_assign(streambuf *this, const streambuf *rhs)
 
 /* ??_Estreambuf@@UAEPAXI@Z */
 DEFINE_THISCALL_WRAPPER(streambuf_vector_dtor, 8)
+#define call_streambuf_vector_dtor(this, flags) CALL_VTBL_FUNC(this, 0,\
+        streambuf*, (streambuf*, unsigned int), (this, flags))
 streambuf* __thiscall streambuf_vector_dtor(streambuf *this, unsigned int flags)
 {
     TRACE("(%p %x)\n", this, flags);
@@ -753,7 +755,7 @@ void __thiscall ios_dtor(ios *this)
 {
     TRACE("(%p)\n", this);
     if (this->delbuf && this->sb)
-        MSVCRT_operator_delete(this->sb);
+        call_streambuf_vector_dtor(this->sb, 1);
     this->sb = NULL;
     this->state = IOSTATE_badbit;
     DeleteCriticalSection(&this->lock);
@@ -958,7 +960,7 @@ void __thiscall ios_init(ios *this, streambuf *sb)
 {
     TRACE("(%p %p)\n", this, sb);
     if (this->delbuf && this->sb)
-        MSVCRT_operator_delete(this->sb);
+        call_streambuf_vector_dtor(this->sb, 1);
     this->sb = sb;
     if (sb == NULL)
         this->state |= IOSTATE_badbit;
diff --git a/dlls/msvcirt/tests/msvcirt.c b/dlls/msvcirt/tests/msvcirt.c
index aded18f9965..bb5a5ed1090 100644
--- a/dlls/msvcirt/tests/msvcirt.c
+++ b/dlls/msvcirt/tests/msvcirt.c
@@ -813,8 +813,8 @@ static void test_ios(void)
     memset(&ios_obj, 0xab, sizeof(ios));
     memset(&ios_obj2, 0xab, sizeof(ios));
     psb = p_operator_new(sizeof(streambuf));
-    if (psb)
-        call_func1(p_streambuf_ctor, psb);
+    ok(psb != NULL, "failed to allocate streambuf object\n");
+    call_func1(p_streambuf_ctor, psb);
 
     /* constructor/destructor */
     call_func2(p_ios_sb_ctor, &ios_obj, NULL);
@@ -857,10 +857,12 @@ static void test_ios(void)
     ok(ios_obj.sb == NULL, "expected %p got %p\n", NULL, ios_obj.sb);
     ok(ios_obj.state == (0x8|IOSTATE_badbit), "expected %x got %x\n", (0x8|IOSTATE_badbit), ios_obj.state);
     ios_obj.sb = psb;
-    ios_obj.delbuf = 1;
+    ios_obj.delbuf = 0;
     call_func2(p_ios_init, &ios_obj, psb);
     ok(ios_obj.sb == psb, "expected %p got %p\n", psb, ios_obj.sb);
     ok(ios_obj.state == 0x8, "expected %x got %x\n", 0x8, ios_obj.state);
+    ios_obj.delbuf = 1;
+    call_func1(p_ios_dtor, &ios_obj);
 
     /* copy constructor */
     call_func2(p_ios_copy_ctor, &ios_obj, &ios_obj2);