diff --git a/source/modules/lilv/config/lilv_config.h b/source/modules/lilv/config/lilv_config.h
index 62299b2d3..a9e2ef519 100644
--- a/source/modules/lilv/config/lilv_config.h
+++ b/source/modules/lilv/config/lilv_config.h
@@ -13,7 +13,7 @@
 #define HAVE_FILENO 1
 #define HAVE_CLOCK_GETTIME 1
 
-#ifdef __WIN32__
+#ifdef _WIN32
  #define LILV_PATH_SEP ";"
  #define LILV_DIR_SEP "\\"
 #else
@@ -28,7 +28,7 @@
  #define LILV_DEFAULT_LV2_PATH "~/.lv2:/lv2"
 #elif defined(__HAIKU__)
  #define LILV_DEFAULT_LV2_PATH "~/.lv2:/system/add-ons/media/lv2plugins"
-#elif defined(__WIN32__)
+#elif defined(_WIN32)
  #define LILV_DEFAULT_LV2_PATH "%APPDATA%\\LV2;%COMMONPROGRAMFILES%\\LV2"
 #else
  #define LILV_DEFAULT_LV2_PATH "~/.lv2:/usr/lib/lv2:/usr/local/lib/lv2"
diff --git a/source/modules/lilv/config/serd_config.h b/source/modules/lilv/config/serd_config.h
index 71fbf6cc8..f9edb4221 100644
--- a/source/modules/lilv/config/serd_config.h
+++ b/source/modules/lilv/config/serd_config.h
@@ -7,7 +7,7 @@
 
 #define HAVE_FILENO 1
 
-#if defined(__APPLE__) || defined(__WIN32__)
+#if defined(__APPLE__) || defined(_WIN32)
  // nothing
 #elif defined(__HAIKU__)
  #define HAVE_POSIX_MEMALIGN 1