diff --git a/core/include/blue/core/ringbuffer.h b/core/include/blue/core/ringbuffer.h
index 67d8e03..ff78840 100644
--- a/core/include/blue/core/ringbuffer.h
+++ b/core/include/blue/core/ringbuffer.h
@@ -40,9 +40,9 @@ BLUE_API size_t b_ringbuffer_write_capacity_remaining(const b_ringbuffer *buf);
 BLUE_API size_t b_ringbuffer_available_data_remaining(const b_ringbuffer *buf);
 
 BLUE_API b_status b_ringbuffer_open_read_buffer(
-	b_ringbuffer *buf, void **ptr, size_t *length);
+	b_ringbuffer *buf, const void **ptr, size_t *length);
 BLUE_API b_status b_ringbuffer_close_read_buffer(
-	b_ringbuffer *buf, void **ptr, size_t nr_read);
+	b_ringbuffer *buf, const void **ptr, size_t nr_read);
 
 BLUE_API b_status b_ringbuffer_open_write_buffer(
 	b_ringbuffer *buf, void **ptr, size_t *capacity);
diff --git a/core/ringbuffer.c b/core/ringbuffer.c
index ec6a36e..ffcb6dc 100644
--- a/core/ringbuffer.c
+++ b/core/ringbuffer.c
@@ -113,7 +113,7 @@ enum b_status b_ringbuffer_read(
 	size_t remaining = count;
 
 	while (remaining > 0) {
-		void *src;
+		const void *src;
 		size_t available;
 		enum b_status status
 			= b_ringbuffer_open_read_buffer(buf, &src, &available);
@@ -242,7 +242,7 @@ size_t b_ringbuffer_available_data_remaining(const struct b_ringbuffer *buf)
 }
 
 enum b_status b_ringbuffer_open_read_buffer(
-	struct b_ringbuffer *buf, void **ptr, size_t *length)
+	struct b_ringbuffer *buf, const void **ptr, size_t *length)
 {
 	if (BUF_LOCKED(buf)) {
 		return B_ERR_BUSY;
@@ -270,7 +270,7 @@ enum b_status b_ringbuffer_open_read_buffer(
 }
 
 enum b_status b_ringbuffer_close_read_buffer(
-	struct b_ringbuffer *buf, void **ptr, size_t nr_read)
+	struct b_ringbuffer *buf, const void **ptr, size_t nr_read)
 {
 	if (!(buf->r_flags & B_RINGBUFFER_READ_LOCKED)) {
 		return B_ERR_BAD_STATE;