diff --git a/library/platform_util.c b/library/platform_util.c
index ca5fe4f..756e226 100644
--- a/library/platform_util.c
+++ b/library/platform_util.c
@@ -35,6 +35,7 @@
 #endif
 
 #include "mbedtls/platform_util.h"
+#include "mbedtls/platform.h"
 #include "mbedtls/threading.h"
 
 #include <stddef.h>