diff --git a/src/hnsw.c b/src/hnsw.c
index c4dae47..a2f481d 100644
--- a/src/hnsw.c
+++ b/src/hnsw.c
@@ -146,7 +146,7 @@ hnswcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
 				 Selectivity *indexSelectivity, double *indexCorrelation,
 				 double *indexPages)
 {
-	GenericCosts costs;
+	GenericCosts costs = {0};
 	int			m;
 	double		ratio;
 	double		startupPages;
@@ -168,8 +168,6 @@ hnswcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
 		return;
 	}
 
-	MemSet(&costs, 0, sizeof(costs));
-
 	genericcostestimate(root, path, loop_count, &costs);
 
 	index = index_open(path->indexinfo->indexoid, NoLock);
diff --git a/src/ivfflat.c b/src/ivfflat.c
index a4a9399..a7f383e 100644
--- a/src/ivfflat.c
+++ b/src/ivfflat.c
@@ -97,7 +97,7 @@ ivfflatcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
 					Selectivity *indexSelectivity, double *indexCorrelation,
 					double *indexPages)
 {
-	GenericCosts costs;
+	GenericCosts costs = {0};
 	int			lists;
 	double		ratio;
 	double		sequentialRatio = 0.5;
@@ -120,8 +120,6 @@ ivfflatcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
 		return;
 	}
 
-	MemSet(&costs, 0, sizeof(costs));
-
 	genericcostestimate(root, path, loop_count, &costs);
 
 	index = index_open(path->indexinfo->indexoid, NoLock);