diff --git a/contrib/btree_gin/btree_gin.c b/contrib/btree_gin/btree_gin.c
index 7ca153e092..5c4f58b8b1 100644
--- a/contrib/btree_gin/btree_gin.c
+++ b/contrib/btree_gin/btree_gin.c
@@ -7,7 +7,6 @@
 
 #include "fmgr.h"
 #include "access/skey.h"
-#include "catalog/pg_collation.h"
 #include "utils/builtins.h"
 #include "utils/bytea.h"
 #include "utils/cash.h"
@@ -123,7 +122,7 @@ gin_compare_prefix_##type(PG_FUNCTION_ARGS)									\
 																			\
 	cmp = DatumGetInt32(DirectFunctionCall2Coll(							\
 				TypeInfo_##type.typecmp,									\
-				DEFAULT_COLLATION_OID,										\
+				PG_GET_COLLATION(),											\
 				(data->strategy == BTLessStrategyNumber ||					\
 				 data->strategy == BTLessEqualStrategyNumber)				\
 				 ? data->datum : a,											\