diff --git a/.cirrus.yml b/.cirrus.yml
index c3799ca..a901c59 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -1,5 +1,5 @@
 freebsd_instance:
-  image_family: freebsd-13-0
+  image_family: freebsd-13-2
 
 task:
   install_script: pkg install -y cmake
diff --git a/c89stringutils/c89stringutils_string_extras.c b/c89stringutils/c89stringutils_string_extras.c
index b24edda..5c6fd42 100644
--- a/c89stringutils/c89stringutils_string_extras.c
+++ b/c89stringutils/c89stringutils_string_extras.c
@@ -192,7 +192,7 @@ size_t strerrorlen_s(errno_t errnum) {
 #ifdef HAVE___VA_COPY
 #define VA_COPY(dest, src) __va_copy(dest, src)
 #else
-#define VA_COPY(dest, src) (dest) = (src)
+#define VA_COPY(dest, src) va_copy((dest), (src))
 #endif
 #endif
 #endif /* ! VA_COPY */