diff --git a/core/libs/tests/GuestSystemFont.cpp b/core/libs/tests/GuestSystemFont.cpp
index 155c0287c..40a1c5588 100644
--- a/core/libs/tests/GuestSystemFont.cpp
+++ b/core/libs/tests/GuestSystemFont.cpp
@@ -197,7 +197,10 @@ int main() {
     FontHandle missing = nullptr;
     Require(sceFontOpenFontSet(library, ChineseGb, 1, nullptr, &missing) == SCE_FONT_ERROR_FONT_OPEN_FAILED && missing == nullptr);
 
-    std::filesystem::rename(fonts / "SST-Bold.otf", root / "SST-Bold.otf");
+    const auto substituteFonts = root / "substitute-fonts";
+    std::filesystem::create_directories(substituteFonts);
+    WriteFile(substituteFonts / "NotoSans-Bold.ttf", SquareGlyphFont('A', 300));
+    SetFontDirectory(substituteFonts);
     FontHandle substitute = nullptr;
     Require(sceFontOpenFontSet(library, EuropeanBold, 3, nullptr, &substitute) == SCE_FONT_OK);
     Require(sceFontSetScalePixel(substitute, 100.0f, 100.0f) == SCE_FONT_OK);