diff --git a/libtiledbsoma/src/utils/arrow_adapter.cc b/libtiledbsoma/src/utils/arrow_adapter.cc
index ea41862ef7..b9e971e1fc 100644
--- a/libtiledbsoma/src/utils/arrow_adapter.cc
+++ b/libtiledbsoma/src/utils/arrow_adapter.cc
@@ -529,6 +529,8 @@ enum ArrowType ArrowAdapter::to_nanoarrow_type(std::string_view sv) {
     return NANOARROW_TYPE_INT64; // NB time resolution set indepedently
   else if (sv == "tsn:")
     return NANOARROW_TYPE_INT64; // NB time resolution set indepedently
+  else if (sv == "tsu:")
+    return NANOARROW_TYPE_INT64; // NB time resolution set indepedently
   else if (sv == "tdD")
     return NANOARROW_TYPE_INT32; // R Date: fractional days since epoch
   else if (sv == "z")