diff --git a/test/fixedbugs/issue46725.go b/test/fixedbugs/issue46725.go
index 29799c7d7e..f6e443e60f 100644
--- a/test/fixedbugs/issue46725.go
+++ b/test/fixedbugs/issue46725.go
@@ -8,7 +8,7 @@ package main
 
 import "runtime"
 
-type T [4]int
+type T [4]int // N.B., [4]int avoids runtime's tiny object allocator
 
 //go:noinline
 func g(x []*T) ([]*T, []*T) { return x, x }
diff --git a/test/fixedbugs/issue54343.go b/test/fixedbugs/issue54343.go
index f8f73f4048..10b91a5398 100644
--- a/test/fixedbugs/issue54343.go
+++ b/test/fixedbugs/issue54343.go
@@ -26,7 +26,7 @@ func New[X any]() *T[X] {
 	return p
 }
 
-type T[X any] int
+type T[X any] [4]int // N.B., [4]int avoids runtime's tiny object allocator
 
 func (*T[X]) M() {}