diff --git a/pipewire-alsa/alsa-plugins/pcm_pipewire.c b/pipewire-alsa/alsa-plugins/pcm_pipewire.c
index 1025a9e82..73b00446e 100644
--- a/pipewire-alsa/alsa-plugins/pcm_pipewire.c
+++ b/pipewire-alsa/alsa-plugins/pcm_pipewire.c
@@ -1252,7 +1252,7 @@ static ssize_t log_write(void *cookie, const char *buf, size_t size)
 	return size;
 }
 
-static cookie_io_functions_t io_funcs = {
+static const cookie_io_functions_t io_funcs = {
 	.write = log_write,
 };
 
diff --git a/spa/plugins/alsa/alsa-pcm.c b/spa/plugins/alsa/alsa-pcm.c
index 7bb5eccd6..0df9f5aa7 100644
--- a/spa/plugins/alsa/alsa-pcm.c
+++ b/spa/plugins/alsa/alsa-pcm.c
@@ -728,7 +728,7 @@ static ssize_t log_write(void *cookie, const char *buf, size_t size)
 	return size;
 }
 
-static cookie_io_functions_t io_funcs = {
+static const cookie_io_functions_t io_funcs = {
 	.write = log_write,
 };