diff --git a/include/mbedtls/lms.h b/include/mbedtls/lms.h
index 5e03d9b5f9..fe87d40a5a 100644
--- a/include/mbedtls/lms.h
+++ b/include/mbedtls/lms.h
@@ -30,6 +30,7 @@
 #include <stdint.h>
 #include <stddef.h>
 
+#include "mbedtls/private_access.h"
 #include "mbedtls/build_info.h"
 
 #define MBEDTLS_ERR_LMS_BAD_INPUT_DATA   -0x0011 /**< Bad data has been input to an LMS function */