diff --git a/include/pqxx/result.hxx b/include/pqxx/result.hxx
index 003a2995d..b38d11a19 100644
--- a/include/pqxx/result.hxx
+++ b/include/pqxx/result.hxx
@@ -32,7 +32,7 @@ namespace pqxx
 {
 namespace internal
 {
-void clear_result(const pq::PGresult *);
+PQXX_LIBEXPORT void clear_result(const pq::PGresult *);
 
 namespace gate
 {