diff --git a/skeletons/tests/check-UTF8String.c b/skeletons/tests/check-UTF8String.c
index 10592a1..8a90b24 100644
--- a/skeletons/tests/check-UTF8String.c
+++ b/skeletons/tests/check-UTF8String.c
@@ -6,6 +6,7 @@
 #include <der_encoder.c>
 #include <xer_decoder.c>
 #include <xer_support.c>
+#include <per_support.c>
 #include <constraints.c>
 #include <sys/time.h>