diff --git a/unix/main.c b/unix/main.c
index c04045a3a0..552df9b804 100644
--- a/unix/main.c
+++ b/unix/main.c
@@ -201,8 +201,8 @@ int usage(char **argv) {
     impl_opts_cnt++;
 #if MICROPY_ENABLE_GC
     printf(
-"  heapsize=<n> -- set the heap size for the GC\n"
-);
+"  heapsize=<n> -- set the heap size for the GC (default %ld)\n"
+, heap_size);
     impl_opts_cnt++;
 #endif