diff --git a/dlls/comctl32/header.c b/dlls/comctl32/header.c
index b91524e742..dc533e198f 100644
--- a/dlls/comctl32/header.c
+++ b/dlls/comctl32/header.c
@@ -114,21 +114,21 @@ static void HEADER_DisposeItem(HEADER_ITEM *lpItem)
     }
 }
 
-static void HEADER_StoreHDItemInHeader(HEADER_ITEM *lpItem, HDITEMW *phdi, BOOL fUnicode)
+static void HEADER_StoreHDItemInHeader(HEADER_ITEM *lpItem, UINT mask, HDITEMW *phdi, BOOL fUnicode)
 {
-    if (phdi->mask & HDI_BITMAP)
+    if (mask & HDI_BITMAP)
         lpItem->hbm = phdi->hbm;
 
-    if (phdi->mask & HDI_FORMAT)
+    if (mask & HDI_FORMAT)
         lpItem->fmt = phdi->fmt;
 
-    if (phdi->mask & HDI_LPARAM)
+    if (mask & HDI_LPARAM)
         lpItem->lParam = phdi->lParam;
 
-    if (phdi->mask & HDI_WIDTH)
+    if (mask & HDI_WIDTH)
         lpItem->cxy = phdi->cxy;
 
-    if (phdi->mask & HDI_IMAGE) 
+    if (mask & HDI_IMAGE) 
     {
         lpItem->iImage = phdi->iImage;
         if (phdi->iImage == I_IMAGECALLBACK)
@@ -137,7 +137,7 @@ static void HEADER_StoreHDItemInHeader(HEADER_ITEM *lpItem, HDITEMW *phdi, BOOL
             lpItem->callbackMask &= ~HDI_IMAGE;
     }
 
-    if (phdi->mask & HDI_TEXT)
+    if (mask & HDI_TEXT)
     {
         if (lpItem->pszText)
         {
@@ -1092,6 +1092,7 @@ HEADER_InsertItemT (HWND hwnd, INT nItem, LPHDITEMW phdi, BOOL bUnicode)
     HEADER_ITEM *lpItem;
     INT       iOrder;
     UINT      i;
+    UINT      copyMask;
 
     if ((phdi == NULL) || (nItem < 0))
 	return -1;
@@ -1154,7 +1155,9 @@ HEADER_InsertItemT (HWND hwnd, INT nItem, LPHDITEMW phdi, BOOL bUnicode)
 
     lpItem = &infoPtr->items[nItem];
     ZeroMemory(lpItem, sizeof(HEADER_ITEM));
-    HEADER_StoreHDItemInHeader(lpItem, phdi, bUnicode);
+    /* cxy, fmt and lParam are copied even if not in the HDITEM mask */
+    copyMask = phdi->mask | HDI_WIDTH | HDI_FORMAT | HDI_LPARAM;
+    HEADER_StoreHDItemInHeader(lpItem, copyMask, phdi, bUnicode);
 
     /* set automatically some format bits */
     if (phdi->mask & HDI_TEXT)
@@ -1267,7 +1270,7 @@ HEADER_SetItemT (HWND hwnd, INT nItem, LPHDITEMW phdi, BOOL bUnicode)
     }
 
     lpItem = &infoPtr->items[nItem];
-    HEADER_StoreHDItemInHeader(lpItem, phdi, bUnicode);
+    HEADER_StoreHDItemInHeader(lpItem, phdi->mask, phdi, bUnicode);
 
     if (phdi->mask & HDI_ORDER)
       {
diff --git a/dlls/comctl32/tests/header.c b/dlls/comctl32/tests/header.c
index 7e0fda7572..856bfc6fa3 100644
--- a/dlls/comctl32/tests/header.c
+++ b/dlls/comctl32/tests/header.c
@@ -269,6 +269,58 @@ static void check_auto_format(void)
     ok(hdiRead.fmt == (HDF_CENTER|HDF_IMAGE), "HDF_IMAGE shouldn't be cleared automatically (fmt=%x)\n", hdiRead.fmt);
 }
 
+static void check_auto_fields(void)
+{
+    HDITEMA hdiCreate;
+    HDITEMA hdiRead;
+    LRESULT res;
+
+    /* Windows stores the format, width, lparam even if they are not in the item's mask */
+    ZeroMemory(&hdiCreate, sizeof(HDITEMA));
+    hdiCreate.mask = HDI_TEXT;
+    hdiCreate.cxy = 100;
+    hdiCreate.pszText = "Test";
+    addReadDelItem(hWndHeader, &hdiCreate, HDI_WIDTH, &hdiRead);
+    TEST_GET_ITEMCOUNT(6);
+    ok(hdiRead.cxy == hdiCreate.cxy, "cxy should be automatically set\n");
+
+    ZeroMemory(&hdiCreate, sizeof(HDITEMA));
+    hdiCreate.mask = HDI_TEXT;
+    hdiCreate.pszText = "Test";
+    hdiCreate.lParam = 0x12345678;
+    addReadDelItem(hWndHeader, &hdiCreate, HDI_LPARAM, &hdiRead);
+    TEST_GET_ITEMCOUNT(6);
+    ok(hdiRead.lParam == hdiCreate.lParam, "lParam should be automatically set\n");
+
+    ZeroMemory(&hdiCreate, sizeof(HDITEMA));
+    hdiCreate.mask = HDI_TEXT;
+    hdiCreate.pszText = "Test";
+    hdiCreate.fmt = HDF_STRING|HDF_CENTER;
+    addReadDelItem(hWndHeader, &hdiCreate, HDI_FORMAT, &hdiRead);
+    TEST_GET_ITEMCOUNT(6);
+    ok(hdiRead.fmt == hdiCreate.fmt, "fmt should be automatically set\n");
+
+    /* others fields are not set */
+    ZeroMemory(&hdiCreate, sizeof(HDITEMA));
+    hdiCreate.mask = HDI_TEXT;
+    hdiCreate.pszText = "Test";
+    hdiCreate.hbm = CreateBitmap(16, 16, 1, 8, NULL);
+    addReadDelItem(hWndHeader, &hdiCreate, HDI_BITMAP, &hdiRead);
+    TEST_GET_ITEMCOUNT(6);
+    ok(hdiRead.hbm == NULL, "hbm should not be automatically set\n");
+    DeleteObject(hdiCreate.hbm);
+
+    ZeroMemory(&hdiCreate, sizeof(HDITEMA));
+    hdiCreate.mask = HDI_IMAGE;
+    hdiCreate.iImage = 17;
+    hdiCreate.pszText = "Test";
+    addReadDelItem(hWndHeader, &hdiCreate, HDI_TEXT, &hdiRead);
+    TEST_GET_ITEMCOUNT(6);
+    ok(hdiRead.pszText==NULL, "pszText shouldn't be automatically set\n");
+
+    /* field from comctl >4.0 not tested as the system probably won't touch them */
+}
+
 static void test_header_control (void)
 {
     LONG res;
@@ -342,6 +394,8 @@ static void test_header_control (void)
 
     check_auto_format();
     TEST_GET_ITEMCOUNT(6);
+    check_auto_fields();
+    TEST_GET_ITEMCOUNT(6);
 
     res = delItem(hWndHeader, 5);
     ok(res == 1, "Deleting Out of Range item should fail with 1 (%ld)\n", res);