diff --git a/imgui_demo.cpp b/imgui_demo.cpp
index 14f70d675..b96d8ea60 100644
--- a/imgui_demo.cpp
+++ b/imgui_demo.cpp
@@ -8194,7 +8194,7 @@ void ImGui::ShowAboutWindow(bool* p_open)
         // - 16 is > strlen("((void)(_EXPR))") which we suggested in our imconfig.h template as a possible way to disable.
         int assert_runs_expression = 0;
         IM_ASSERT(++assert_runs_expression);
-        int assert_expand_len = (int)strlen(IM_STRINGIFY(IM_ASSERT(true)));
+        int assert_expand_len = (int)strlen(IM_STRINGIFY((IM_ASSERT(true))));
         bool assert_maybe_disabled = (!assert_runs_expression || assert_expand_len <= 16);
         ImGui::Text("IM_ASSERT: runs expression: %s. expand size: %s%s",
             assert_runs_expression ? "OK" : "KO", (assert_expand_len > 16) ? "OK" : "KO", assert_maybe_disabled ? " (MAYBE DISABLED?!)" : "");