diff --git a/builder/sizes_test.go b/builder/sizes_test.go
index b207d92e1e..7a99d784e8 100644
--- a/builder/sizes_test.go
+++ b/builder/sizes_test.go
@@ -41,7 +41,7 @@ func TestBinarySize(t *testing.T) {
 	// This is a small number of very diverse targets that we want to test.
 	tests := []sizeTest{
 		// microcontrollers
-		{"hifive1b", "examples/echo", 4688, 280, 0, 2268},
+		{"hifive1b", "examples/echo", 4692, 280, 0, 2268},
 		{"microbit", "examples/serial", 2952, 388, 8, 2272},
 		{"wioterminal", "examples/pininterrupt", 6148, 1484, 116, 6832},