diff --git a/src/hnsw.c b/src/hnsw.c
index d0d7086..5d16ae3 100644
--- a/src/hnsw.c
+++ b/src/hnsw.c
@@ -223,7 +223,7 @@ hnswcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
 static bytea *
 hnswoptions(Datum reloptions, bool validate)
 {
-#if PG_VERSION_NUM >= 180000
+#if PG_VERSION_NUM >= 180000 && defined(__GNUC__)
 #pragma GCC diagnostic ignored "-Wmissing-field-initializers"
 #endif
 	static const relopt_parse_elt tab[] = {
diff --git a/src/ivfflat.c b/src/ivfflat.c
index 9d95f1d..3ff0299 100644
--- a/src/ivfflat.c
+++ b/src/ivfflat.c
@@ -151,7 +151,7 @@ ivfflatcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
 static bytea *
 ivfflatoptions(Datum reloptions, bool validate)
 {
-#if PG_VERSION_NUM >= 180000
+#if PG_VERSION_NUM >= 180000 && defined(__GNUC__)
 #pragma GCC diagnostic ignored "-Wmissing-field-initializers"
 #endif
 	static const relopt_parse_elt tab[] = {