diff --git a/src/postgres/src/bin/pg_dump/pg_dump.c b/src/postgres/src/bin/pg_dump/pg_dump.c
index 0a38b9edbacb..2c8a8b09d0dd 100644
--- a/src/postgres/src/bin/pg_dump/pg_dump.c
+++ b/src/postgres/src/bin/pg_dump/pg_dump.c
@@ -16917,7 +16917,7 @@ dumpConstraint(Archive *fout, const ConstraintInfo *coninfo)
 		}
 		else
 		{
-			appendPQExpBuffer(q, "%s",
+			appendPQExpBuffer(q, "%s ",
 							  coninfo->contype == 'p' ? "PRIMARY KEY" : "UNIQUE");
 			/*
 			 * If a table has an unique constraint with index definition,