diff --git a/spa/plugins/aec/aec-null.c b/spa/plugins/aec/aec-null.c
index 9029e6d63..b8d5b8528 100644
--- a/spa/plugins/aec/aec-null.c
+++ b/spa/plugins/aec/aec-null.c
@@ -58,7 +58,7 @@ static int null_run(void *object, const float *rec[], const float *play[], float
 	return 0;
 }
 
-static struct spa_audio_aec_methods impl_aec = {
+static const struct spa_audio_aec_methods impl_aec = {
 	SPA_VERSION_AUDIO_AEC,
 	.init = null_init,
 	.run = null_run,
diff --git a/spa/plugins/aec/aec-webrtc.cpp b/spa/plugins/aec/aec-webrtc.cpp
index 2d86b85c8..4f94f9f48 100644
--- a/spa/plugins/aec/aec-webrtc.cpp
+++ b/spa/plugins/aec/aec-webrtc.cpp
@@ -158,7 +158,7 @@ static int webrtc_run(void *data, const float *rec[], const float *play[], float
 	return 0;
 }
 
-static struct spa_audio_aec_methods impl_aec = {
+static const struct spa_audio_aec_methods impl_aec = {
 	SPA_VERSION_AUDIO_AEC_METHODS,
 	.add_listener = NULL,
 	.init = webrtc_init,