diff --git a/arch/sandbox/os/common.c b/arch/sandbox/os/common.c
index e67ea14..382a923 100644
--- a/arch/sandbox/os/common.c
+++ b/arch/sandbox/os/common.c
@@ -236,7 +236,7 @@
 		filename = devname;
 		snprintf(tmp, sizeof(tmp),
 			 devname_template, (*devname_number)++);
-		devname = strdup(tmp);
+		devname = tmp;
 	}
 
 	printf("add %s backed by file %s%s\n", devname,