diff --git a/imgui_widgets.cpp b/imgui_widgets.cpp
index 43d98bb88..d7214b6c2 100644
--- a/imgui_widgets.cpp
+++ b/imgui_widgets.cpp
@@ -4289,7 +4289,7 @@ void ImGuiInputTextCallbackData::InsertChars(int pos, const char* new_text, cons
     // Grow internal buffer if needed
     const bool is_resizable = (Flags & ImGuiInputTextFlags_CallbackResize) != 0;
     const int new_text_len = new_text_end ? (int)(new_text_end - new_text) : (int)ImStrlen(new_text);
-    if (new_text_len + BufTextLen + 1 > obj->TextA.Size)
+    if (new_text_len + BufTextLen + 1 > obj->TextA.Size && (Flags & ImGuiInputTextFlags_ReadOnly) == 0)
     {
         if (!is_resizable)
             return;