diff --git a/src/interfaces/libpq/libpqdll.def b/src/interfaces/libpq/libpqdll.def
index ee8b6384928..e42b25d43b0 100644
--- a/src/interfaces/libpq/libpqdll.def
+++ b/src/interfaces/libpq/libpqdll.def
@@ -65,3 +65,4 @@ EXPORTS
 	lo_export		@ 62
 	pgresStatus		@ 63
 	PQmblen			@ 64
+	PQresultErrorMessage	@ 65