diff --git a/spa/plugins/aec/aec-null.c b/spa/plugins/aec/aec-null.c
index 0dea9fc29..76e6d8a50 100644
--- a/spa/plugins/aec/aec-null.c
+++ b/spa/plugins/aec/aec-null.c
@@ -151,7 +151,7 @@ impl_enum_interface_info(const struct spa_handle_factory *factory,
 	return 1;
 }
 
-const struct spa_handle_factory spa_aec_null_factory = {
+static const struct spa_handle_factory spa_aec_null_factory = {
 	SPA_VERSION_HANDLE_FACTORY,
 	SPA_NAME_AEC,
 	NULL,
@@ -160,7 +160,6 @@ const struct spa_handle_factory spa_aec_null_factory = {
 	impl_enum_interface_info,
 };
 
-
 SPA_EXPORT
 int spa_handle_factory_enum(const struct spa_handle_factory **factory, uint32_t *index)
 {
diff --git a/spa/plugins/aec/aec-webrtc.cpp b/spa/plugins/aec/aec-webrtc.cpp
index c3e0be76b..2d86b85c8 100644
--- a/spa/plugins/aec/aec-webrtc.cpp
+++ b/spa/plugins/aec/aec-webrtc.cpp
@@ -248,7 +248,7 @@ impl_enum_interface_info(const struct spa_handle_factory *factory,
 	return 1;
 }
 
-const struct spa_handle_factory spa_aec_webrtc_factory = {
+static const struct spa_handle_factory spa_aec_webrtc_factory = {
 	SPA_VERSION_HANDLE_FACTORY,
 	SPA_NAME_AEC,
 	NULL,
@@ -257,7 +257,6 @@ const struct spa_handle_factory spa_aec_webrtc_factory = {
 	impl_enum_interface_info,
 };
 
-
 SPA_EXPORT
 int spa_handle_factory_enum(const struct spa_handle_factory **factory, uint32_t *index)
 {