diff --git a/lib/vtls/rustls.c b/lib/vtls/rustls.c
index be2e739e00..2ac97ce28e 100644
--- a/lib/vtls/rustls.c
+++ b/lib/vtls/rustls.c
@@ -34,7 +34,7 @@
 #include "sendf.h"
 #include "vtls.h"
 #include "select.h"
-
+#include "strerror.h"
 #include "multiif.h"
 
 struct ssl_backend_data