diff --git a/include/nlohmann/detail/output/binary_writer.hpp b/include/nlohmann/detail/output/binary_writer.hpp
index 0c3c823ac..c9bdc696f 100644
--- a/include/nlohmann/detail/output/binary_writer.hpp
+++ b/include/nlohmann/detail/output/binary_writer.hpp
@@ -2422,7 +2422,6 @@ class binary_writer
             nothing large has been written then, and the caller writes the
             document in two passes, which reports that error
     */
-    template<typename SinkType = OutputSinkType, typename std::enable_if<is_detected<sink_written_t, SinkType>::value, int>::type = 0>
     bool write_bson_document_single_pass(const BasicJsonType& document)
     {
         const std::size_t start = oa.written();
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 693320ed5..2a7289203 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -30394,7 +30394,6 @@ class binary_writer
             nothing large has been written then, and the caller writes the
             document in two passes, which reports that error
     */
-    template<typename SinkType = OutputSinkType, typename std::enable_if<is_detected<sink_written_t, SinkType>::value, int>::type = 0>
     bool write_bson_document_single_pass(const BasicJsonType& document)
     {
         const std::size_t start = oa.written();