diff --git a/src/Bitmap.cpp b/src/Bitmap.cpp
index b817033e..2f9a4d02 100644
--- a/src/Bitmap.cpp
+++ b/src/Bitmap.cpp
@@ -12,6 +12,7 @@
 #define STBI_ONLY_PNG
 #define STBI_NO_LINEAR
 #define STBI_NO_STDIO
+#define STBI_NO_THREAD_LOCALS
 #include "../external/stb_image.h"
 
 #include "File.h"