diff --git a/dlls/riched20/editor.c b/dlls/riched20/editor.c
index 5bfc0aa..89a5b6f 100644
--- a/dlls/riched20/editor.c
+++ b/dlls/riched20/editor.c
@@ -2260,7 +2260,7 @@ static LRESULT ME_Char(ME_TextEditor *editor, WPARAM charCode,
 
   if (GetWindowLongW(editor->hWnd, GWL_STYLE) & ES_READONLY) {
     MessageBeep(MB_ICONERROR);
-    return 0; /* FIXME really 0 ? */
+    return 0x40201;
   }
 
   if (((unsigned)wstr)>=' '
diff --git a/dlls/riched20/tests/editor.c b/dlls/riched20/tests/editor.c
index 11930ad..4361b37 100644
--- a/dlls/riched20/tests/editor.c
+++ b/dlls/riched20/tests/editor.c
@@ -6181,6 +6181,29 @@ static void test_WM_GETDLGCODE(void)
     DestroyWindow(hwnd);
 }
 
+static void test_ES_READONLY(void)
+{
+    HWND hwnd;
+    UINT ret;
+
+    hwnd = CreateWindowEx(0, RICHEDIT_CLASS, NULL,
+                          WS_POPUP|ES_MULTILINE|ES_READONLY,
+                          0, 0, 200, 60, NULL, NULL, hmoduleRichEdit, NULL);
+    ok(hwnd != NULL, "class: %s, error: %d\n", RICHEDIT_CLASS, (int) GetLastError());
+
+    ret = SendMessage(hwnd, WM_CHAR, 'a', MapVirtualKey('a', MAPVK_VK_TO_VSC) | 0x0001);
+    ok(ret == 0x40201, "WM_CHAR returned %x\n", ret);
+
+    ret = SendMessage(hwnd, WM_KEYDOWN, VK_RETURN,
+                      MapVirtualKey(VK_RETURN, MAPVK_VK_TO_VSC) | 0x0001);
+    ok(ret == 0, "WM_KEYDOWN returned %x\n", ret);
+    ret = SendMessage(hwnd, WM_CHAR, VK_RETURN,
+                      MapVirtualKey(VK_RETURN, MAPVK_VK_TO_VSC) | 0x0001);
+    ok(ret == 0x40201, "WM_CHAR returned %x\n", ret);
+
+    DestroyWindow(hwnd);
+}
+
 START_TEST( editor )
 {
   /* Must explicitly LoadLibrary(). The test has no references to functions in
@@ -6235,6 +6258,7 @@ START_TEST( editor )
   test_auto_yscroll();
   test_format_rect();
   test_WM_GETDLGCODE();
+  test_ES_READONLY();
 
   /* Set the environment variable WINETEST_RICHED20 to keep windows
    * responsive and open for 30 seconds. This is useful for debugging.