diff --git a/src/test/test_buffer.c b/src/test/test_buffer.c
index 05e5306..11c9041 100644
--- a/src/test/test_buffer.c
+++ b/src/test/test_buffer.c
@@ -2,7 +2,7 @@
 
 #include "test_buffer.h"
 
-rt_buffer_t *buffer_init() {
+rt_buffer_t *buffer_init(void) {
     rt_buffer_t *buffer = calloc(1, sizeof(rt_buffer_t));
     buffer->size = 1024;
     buffer->bytes = malloc(buffer->size);
diff --git a/src/test/test_buffer.h b/src/test/test_buffer.h
index 9ff5a5b..cdceac0 100644
--- a/src/test/test_buffer.h
+++ b/src/test/test_buffer.h
@@ -10,7 +10,7 @@ typedef struct rt_buffer_ctx_s {
     size_t       pos;
 } rt_buffer_ctx_t;
 
-rt_buffer_t *buffer_init();
+rt_buffer_t *buffer_init(void);
 void buffer_reset(rt_buffer_t *buffer);
 void buffer_grow(rt_buffer_t *buffer, size_t len);
 void buffer_free(rt_buffer_t *buffer);