diff --git a/library/ecp.c b/library/ecp.c
index 6a005d5..b07d6a2 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -77,6 +77,8 @@
 #include "mbedtls/platform_util.h"
 #include "mbedtls/error.h"
 
+#include "ecp_invasive.h"
+
 #include <string.h>
 
 #if !defined(MBEDTLS_ECP_ALT)