diff --git a/mongoose_config.h b/mongoose_config.h
index 5eb14b2..6495f3a 100644
--- a/mongoose_config.h
+++ b/mongoose_config.h
@@ -1,3 +1,4 @@
 #ifndef MONGOOSE_CONFIG_H
 #define MONGOOSE_CONFIG_H
+#define MG_ENABLE_POSIX_FS 1
 #endif