diff --git a/include/utl/zip.h b/include/utl/zip.h
index 59c72d7..35f9ba4 100644
--- a/include/utl/zip.h
+++ b/include/utl/zip.h
@@ -5,6 +5,7 @@
 #include <stdexcept>
 
 #include "utl/forward_type.h"
+#include "utl/verify.h"
 
 namespace utl {
 namespace detail {