diff --git a/include/utl/pipes/transform.h b/include/utl/pipes/transform.h
index 1656041..1b260cd 100644
--- a/include/utl/pipes/transform.h
+++ b/include/utl/pipes/transform.h
@@ -3,6 +3,7 @@
 #include <utility>
 
 #include "utl/clear_t.h"
+#include "utl/pipes/is_range.h"
 #include "utl/pipes/make_range.h"
 
 namespace utl {
@@ -47,4 +48,4 @@ transform_t<Transform> transform(Transform&& f) {
 template <typename Range, typename Transform>
 struct is_range<transform_range<Range, Transform>> : std::true_type {};
 
-}  // namespace utl
\ No newline at end of file
+}  // namespace utl