diff --git a/src/os/windows/font_win32.cpp b/src/os/windows/font_win32.cpp
--- a/src/os/windows/font_win32.cpp
+++ b/src/os/windows/font_win32.cpp
@@ -78,7 +78,7 @@ FT_Error GetFontByFaceName(const char *f
 	ret = RegOpenKeyEx(HKEY_LOCAL_MACHINE, FONT_DIR_NT, 0, KEY_READ, &hKey);
 
 	if (ret != ERROR_SUCCESS) {
-		DEBUG(freetype, 0, "Cannot open registry key HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Fonts");
+		Debug(freetype, 0, "Cannot open registry key HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Fonts");
 		return err;
 	}
 
@@ -113,7 +113,7 @@ FT_Error GetFontByFaceName(const char *f
 	}
 
 	if (!SUCCEEDED(SHGetFolderPath(nullptr, CSIDL_FONTS, nullptr, SHGFP_TYPE_CURRENT, vbuffer))) {
-		DEBUG(freetype, 0, "SHGetFolderPath cannot return fonts directory");
+		Debug(freetype, 0, "SHGetFolderPath cannot return fonts directory");
 		goto folder_error;
 	}
 
@@ -334,17 +334,17 @@ static int CALLBACK EnumFontCallback(con
 
 	info->callback->SetFontNames(info->settings, font_name, &logfont->elfLogFont);
 	if (info->callback->FindMissingGlyphs()) return 1;
-	DEBUG(freetype, 1, "Fallback font: %s (%s)", font_name, english_name);
+	Debug(freetype, 1, "Fallback font: {} ({})", font_name, english_name);
 	return 0; // stop enumerating
 }
 
 bool SetFallbackFont(FreeTypeSettings *settings, const char *language_isocode, int winlangid, MissingGlyphSearcher *callback)
 {
-	DEBUG(freetype, 1, "Trying fallback fonts");
+	Debug(freetype, 1, "Trying fallback fonts");
 	EFCParam langInfo;
 	if (GetLocaleInfo(MAKELCID(winlangid, SORT_DEFAULT), LOCALE_FONTSIGNATURE, (LPTSTR)&langInfo.locale, sizeof(langInfo.locale) / sizeof(wchar_t)) == 0) {
 		/* Invalid langid or some other mysterious error, can't determine fallback font. */
-		DEBUG(freetype, 1, "Can't get locale info for fallback font (langid=0x%x)", winlangid);
+		Debug(freetype, 1, "Can't get locale info for fallback font (langid=0x{:x})", winlangid);
 		return false;
 	}
 	langInfo.settings = settings;
@@ -439,7 +439,7 @@ void Win32FontCache::SetFontSize(FontSiz
 	this->glyph_size.cx = otm->otmTextMetrics.tmMaxCharWidth;
 	this->glyph_size.cy = otm->otmTextMetrics.tmHeight;
 
-	DEBUG(freetype, 2, "Loaded font '%s' with size %d", FS2OTTD((LPWSTR)((BYTE *)otm + (ptrdiff_t)otm->otmpFullName)).c_str(), pixels);
+	Debug(freetype, 2, "Loaded font '{}' with size {}", FS2OTTD((LPWSTR)((BYTE *)otm + (ptrdiff_t)otm->otmpFullName)), pixels);
 }
 
 /**