diff --git a/src/backend/commands/copy.c b/src/backend/commands/copy.c
index 01a63c823e2..3102ab18c57 100644
--- a/src/backend/commands/copy.c
+++ b/src/backend/commands/copy.c
@@ -923,7 +923,8 @@ DoCopy(ParseState *pstate, const CopyStmt *stmt,
 			 * relation which we have opened and locked.
 			 */
 			from = makeRangeVar(get_namespace_name(RelationGetNamespace(rel)),
-								RelationGetRelationName(rel), -1);
+								pstrdup(RelationGetRelationName(rel)),
+								-1);
 
 			/* Build query */
 			select = makeNode(SelectStmt);