diff --git a/contrib/postgres_fdw/postgres_fdw.c b/contrib/postgres_fdw/postgres_fdw.c
index 25b287be069..b51ff108741 100644
--- a/contrib/postgres_fdw/postgres_fdw.c
+++ b/contrib/postgres_fdw/postgres_fdw.c
@@ -5177,6 +5177,8 @@ postgresAcquireSampleRowsFunc(Relation relation, int elevel,
 			Assert(sample_frac >= 0.0 && sample_frac <= 1.0);
 		}
 	}
+	else
+		reltuples = 0;
 
 	/*
 	 * For "auto" method, pick the one we believe is best. For servers with