diff --git a/test/recover4.go b/test/recover4.go
index cda08138f9..4c50260686 100644
--- a/test/recover4.go
+++ b/test/recover4.go
@@ -52,6 +52,8 @@ func main() {
 		log.Fatalf("mmap: %v", err)
 	}
 
+	other := make([]byte, 16*size)
+
 	// Note: Cannot call syscall.Munmap, because Munmap checks
 	// that you are unmapping a whole region returned by Mmap.
 	// We are trying to unmap just a hole in the middle.
@@ -59,8 +61,6 @@ func main() {
 		log.Fatalf("munmap: %v", err)
 	}
 
-	other := make([]byte, 16*size)
-
 	// Check that memcopy returns the actual amount copied
 	// before the fault (8*size - 5, the offset we skip in the argument).
 	n, err := memcopy(data[5:], other)