diff --git a/cpp/include/cudf/types.hpp b/cpp/include/cudf/types.hpp
index c69fc8111750..9c631dd31654 100644
--- a/cpp/include/cudf/types.hpp
+++ b/cpp/include/cudf/types.hpp
@@ -38,14 +38,6 @@
  * @brief Type declarations for libcudf.
  */
 
-// Forward declarations
-/// @cond
-namespace rmm {
-class device_buffer;
-/// @endcond
-
-}  // namespace rmm
-
 namespace CUDF_EXPORT cudf {
 // Forward declaration
 class column;