diff --git a/library/rsa.c b/library/rsa.c
index 3866b73..a395542 100644
--- a/library/rsa.c
+++ b/library/rsa.c
@@ -44,7 +44,7 @@
 #include "mbedtls/oid.h"
 #include "mbedtls/platform_util.h"
 #include "mbedtls/error.h"
-#include "constant_time.h"
+#include "constant_time_internal.h"
 #include "mbedtls/constant_time.h"
 
 #include <string.h>