diff --git a/src/fontcache.cpp b/src/fontcache.cpp
index 639b23e4e5..84586b1c1c 100644
--- a/src/fontcache.cpp
+++ b/src/fontcache.cpp
@@ -252,5 +252,5 @@ void UninitFontCache()
 
 #if !defined(_WIN32) && !defined(__APPLE__) && !defined(WITH_FONTCONFIG) && !defined(WITH_COCOA)
 
-bool SetFallbackFont(FontCacheSettings *, const std::string &, int, MissingGlyphSearcher *) { return false; }
+bool SetFallbackFont(FontCacheSettings *, const std::string &, MissingGlyphSearcher *) { return false; }
 #endif /* !defined(_WIN32) && !defined(__APPLE__) && !defined(WITH_FONTCONFIG) && !defined(WITH_COCOA) */
diff --git a/src/fontdetection.h b/src/fontdetection.h
index 2a316da505..c6083878b3 100644
--- a/src/fontdetection.h
+++ b/src/fontdetection.h
@@ -33,10 +33,9 @@ FT_Error GetFontByFaceName(const char *font_name, FT_Face *face);
  * This function must set all fonts of settings.
  * @param settings the settings to overwrite the fontname of.
  * @param language_isocode the language, e.g. en_GB.
- * @param winlangid the language ID windows style.
  * @param callback The function to call to check for missing glyphs.
  * @return true if a font has been set, false otherwise.
  */
-bool SetFallbackFont(struct FontCacheSettings *settings, const std::string &language_isocode, int winlangid, class MissingGlyphSearcher *callback);
+bool SetFallbackFont(struct FontCacheSettings *settings, const std::string &language_isocode, class MissingGlyphSearcher *callback);
 
 #endif
diff --git a/src/os/macosx/font_osx.cpp b/src/os/macosx/font_osx.cpp
index 5d8b79e1be..5ec493fa51 100644
--- a/src/os/macosx/font_osx.cpp
+++ b/src/os/macosx/font_osx.cpp
@@ -24,7 +24,7 @@
 
 #include "safeguards.h"
 
-bool SetFallbackFont(FontCacheSettings *settings, const std::string &language_isocode, int, MissingGlyphSearcher *callback)
+bool SetFallbackFont(FontCacheSettings *settings, const std::string &language_isocode, MissingGlyphSearcher *callback)
 {
 	/* Determine fallback font using CoreText. This uses the language isocode
 	 * to find a suitable font. CoreText is available from 10.5 onwards. */
diff --git a/src/os/unix/font_unix.cpp b/src/os/unix/font_unix.cpp
index 6ab1d99823..207c248f98 100644
--- a/src/os/unix/font_unix.cpp
+++ b/src/os/unix/font_unix.cpp
@@ -98,7 +98,7 @@ FT_Error GetFontByFaceName(const char *font_name, FT_Face *face)
 	return err;
 }
 
-bool SetFallbackFont(FontCacheSettings *settings, const std::string &language_isocode, int, MissingGlyphSearcher *callback)
+bool SetFallbackFont(FontCacheSettings *settings, const std::string &language_isocode, MissingGlyphSearcher *callback)
 {
 	bool ret = false;
 
diff --git a/src/os/windows/font_win32.cpp b/src/os/windows/font_win32.cpp
index c0ae666bee..c10404d74f 100644
--- a/src/os/windows/font_win32.cpp
+++ b/src/os/windows/font_win32.cpp
@@ -86,13 +86,14 @@ static int CALLBACK EnumFontCallback(const ENUMLOGFONTEX *logfont, const NEWTEXT
 	return 0; // stop enumerating
 }
 
-bool SetFallbackFont(FontCacheSettings *settings, const std::string &, int winlangid, MissingGlyphSearcher *callback)
+bool SetFallbackFont(FontCacheSettings *settings, const std::string &language_isocode, MissingGlyphSearcher *callback)
 {
 	Debug(fontcache, 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(fontcache, 1, "Can't get locale info for fallback font (langid=0x{:x})", winlangid);
+	std::wstring lang = OTTD2FS(language_isocode.substr(0, language_isocode.find('_')));
+	if (GetLocaleInfoEx(lang.c_str(), LOCALE_FONTSIGNATURE, reinterpret_cast<LPWSTR>(&langInfo.locale), sizeof(langInfo.locale) / sizeof(wchar_t)) == 0) {
+		/* Invalid isocode or some other mysterious error, can't determine fallback font. */
+		Debug(fontcache, 1, "Can't get locale info for fallback font (isocode={})", language_isocode);
 		return false;
 	}
 	langInfo.settings = settings;
diff --git a/src/stdafx.h b/src/stdafx.h
index c0c58f865c..3629e85ff3 100644
--- a/src/stdafx.h
+++ b/src/stdafx.h
@@ -11,12 +11,9 @@
 #define STDAFX_H
 
 #if defined(_WIN32)
-	/* MinGW defaults to Windows 7 if none of these are set, and they must be set before any MinGW header is included */
-#	define NTDDI_VERSION NTDDI_WINXP // Windows XP
-#	define _WIN32_WINNT 0x501        // Windows XP
-#	define _WIN32_WINDOWS 0x501      // Windows XP
-#	define WINVER 0x0501             // Windows XP
-#	define _WIN32_IE_ 0x0600         // 6.0 (XP+)
+	/* Minimum supported version is Windows 7. */
+#	define NTDDI_VERSION NTDDI_WIN7
+#	define _WIN32_WINNT _WIN32_WINNT_WIN7
 #endif
 
 #ifdef _MSC_VER
diff --git a/src/strings.cpp b/src/strings.cpp
index d58f41fc8b..b87790ff54 100644
--- a/src/strings.cpp
+++ b/src/strings.cpp
@@ -2297,7 +2297,7 @@ void CheckForMissingGlyphs(bool base_font, MissingGlyphSearcher *searcher)
 		_fcsettings.mono.os_handle = nullptr;
 		_fcsettings.medium.os_handle = nullptr;
 
-		bad_font = !SetFallbackFont(&_fcsettings, _langpack.langpack->isocode, _langpack.langpack->winlangid, searcher);
+		bad_font = !SetFallbackFont(&_fcsettings, _langpack.langpack->isocode, searcher);
 
 		_fcsettings = backup;