diff --git a/imgui.cpp b/imgui.cpp
index ddd3b8b7a..5cff48ff6 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -16142,7 +16142,7 @@ void ImGui::ShowFontAtlas(ImFontAtlas* atlas)
                     ImFontAtlasRect r = {};
                     atlas->GetCustomRect(id, &r);
                     ImStrv buf;
-                    ImFormatStringToTempBuffer(&buf, NULL, "ID:%08X, used:%d, { w:%3d, h:%3d } { x:%4d, y:%4d }", id, entry.IsUsed, r.w, r.h, r.x, r.y);
+                    ImFormatStringToTempBuffer(&buf, "ID:%08X, used:%d, { w:%3d, h:%3d } { x:%4d, y:%4d }", id, entry.IsUsed, r.w, r.h, r.x, r.y);
                     TableNextColumn();
                     Selectable(buf.Begin);
                     if (IsItemHovered())
@@ -17827,7 +17827,7 @@ void ImGui::ShowIDStackToolWindow(bool* p_open)
             if (c == '/')
                 tool->ResultTempBuf.append("\\");
             if (c < 256 || !tool->OptHexEncodeNonAsciiChars)
-                tool->ResultTempBuf.append(p, p_next);
+                tool->ResultTempBuf.append(ImStrv(p, p_next));
             else for (; p < p_next; p++)
                 tool->ResultTempBuf.appendf("\\x%02x", (unsigned char)*p);
             p = p_next;
diff --git a/imgui_draw.cpp b/imgui_draw.cpp
index 064d0aba3..a1500edd6 100644
--- a/imgui_draw.cpp
+++ b/imgui_draw.cpp
@@ -3135,7 +3135,7 @@ ImFont* ImFontAtlas::AddFontFromFileTTF(ImStrv filename, float size_pixels, cons
     {
         if (font_cfg_template == NULL || (font_cfg_template->Flags & ImFontFlags_NoLoadError) == 0)
         {
-            IMGUI_DEBUG_LOG("While loading '%s'\n", filename);
+            IMGUI_DEBUG_LOG("While loading '%.*s'\n", filename.length(), filename.Begin);
             IM_ASSERT_USER_ERROR(0, "Could not load font file!");
         }
         return NULL;