diff --git a/ports/unix/coverage.c b/ports/unix/coverage.c
index f059c21be4..3763063870 100644
--- a/ports/unix/coverage.c
+++ b/ports/unix/coverage.c
@@ -613,45 +613,44 @@ STATIC mp_obj_t extra_coverage(void) {
     // ringbuf
     {
         byte buf[100];
-        ringbuf_t ringbuf = {buf, sizeof(buf), 0, 0};
+        ringbuf_t ringbuf = {buf, sizeof(buf), 0, 0, 0};
 
         mp_printf(&mp_plat_print, "# ringbuf\n");
 
         // Single-byte put/get with empty ringbuf.
-        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_free(&ringbuf), ringbuf_avail(&ringbuf));
+        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_num_empty(&ringbuf), ringbuf_num_filled(&ringbuf));
         ringbuf_put(&ringbuf, 22);
-        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_free(&ringbuf), ringbuf_avail(&ringbuf));
+        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_num_empty(&ringbuf), ringbuf_num_filled(&ringbuf));
         mp_printf(&mp_plat_print, "%d\n", ringbuf_get(&ringbuf));
-        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_free(&ringbuf), ringbuf_avail(&ringbuf));
+        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_num_empty(&ringbuf), ringbuf_num_filled(&ringbuf));
 
         // Two-byte put/get with empty ringbuf.
         ringbuf_put16(&ringbuf, 0xaa55);
-        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_free(&ringbuf), ringbuf_avail(&ringbuf));
+        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_num_empty(&ringbuf), ringbuf_num_filled(&ringbuf));
         mp_printf(&mp_plat_print, "%04x\n", ringbuf_get16(&ringbuf));
-        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_free(&ringbuf), ringbuf_avail(&ringbuf));
+        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_num_empty(&ringbuf), ringbuf_num_filled(&ringbuf));
 
         // Two-byte put with full ringbuf.
         for (int i = 0; i < 99; ++i) {
             ringbuf_put(&ringbuf, i);
         }
-        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_free(&ringbuf), ringbuf_avail(&ringbuf));
+        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_num_empty(&ringbuf), ringbuf_num_filled(&ringbuf));
         mp_printf(&mp_plat_print, "%d\n", ringbuf_put16(&ringbuf, 0x11bb));
         // Two-byte put with one byte free.
         ringbuf_get(&ringbuf);
-        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_free(&ringbuf), ringbuf_avail(&ringbuf));
+        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_num_empty(&ringbuf), ringbuf_num_filled(&ringbuf));
         mp_printf(&mp_plat_print, "%d\n", ringbuf_put16(&ringbuf, 0x3377));
         ringbuf_get(&ringbuf);
-        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_free(&ringbuf), ringbuf_avail(&ringbuf));
+        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_num_empty(&ringbuf), ringbuf_num_filled(&ringbuf));
         mp_printf(&mp_plat_print, "%d\n", ringbuf_put16(&ringbuf, 0xcc99));
         for (int i = 0; i < 97; ++i) {
             ringbuf_get(&ringbuf);
         }
         mp_printf(&mp_plat_print, "%04x\n", ringbuf_get16(&ringbuf));
-        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_free(&ringbuf), ringbuf_avail(&ringbuf));
+        mp_printf(&mp_plat_print, "%d %d\n", ringbuf_num_empty(&ringbuf), ringbuf_num_filled(&ringbuf));
 
         // Two-byte put with wrap around on first byte:
-        ringbuf.iput = 0;
-        ringbuf.iget = 0;
+        ringbuf_clear(&ringbuf);
         for (int i = 0; i < 99; ++i) {
             ringbuf_put(&ringbuf, i);
             ringbuf_get(&ringbuf);
@@ -660,8 +659,7 @@ STATIC mp_obj_t extra_coverage(void) {
         mp_printf(&mp_plat_print, "%04x\n", ringbuf_get16(&ringbuf));
 
         // Two-byte put with wrap around on second byte:
-        ringbuf.iput = 0;
-        ringbuf.iget = 0;
+        ringbuf_clear(&ringbuf);
         for (int i = 0; i < 98; ++i) {
             ringbuf_put(&ringbuf, i);
             ringbuf_get(&ringbuf);
@@ -670,13 +668,11 @@ STATIC mp_obj_t extra_coverage(void) {
         mp_printf(&mp_plat_print, "%04x\n", ringbuf_get16(&ringbuf));
 
         // Two-byte get from empty ringbuf.
-        ringbuf.iput = 0;
-        ringbuf.iget = 0;
+        ringbuf_clear(&ringbuf);
         mp_printf(&mp_plat_print, "%d\n", ringbuf_get16(&ringbuf));
 
         // Two-byte get from ringbuf with one byte available.
-        ringbuf.iput = 0;
-        ringbuf.iget = 0;
+        ringbuf_clear(&ringbuf);
         ringbuf_put(&ringbuf, 0xaa);
         mp_printf(&mp_plat_print, "%d\n", ringbuf_get16(&ringbuf));
     }