diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 9329d319bd03..0d2ebf6a84bc 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -333,7 +333,7 @@ struct machine *machines__findnew(struct machines *machines, pid_t pid)
 	if ((pid != HOST_KERNEL_ID) &&
 	    (pid != DEFAULT_GUEST_KERNEL_ID) &&
 	    (symbol_conf.guestmount)) {
-		sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
+		snprintf(path, sizeof(path), "%s/%d", symbol_conf.guestmount, pid);
 		if (access(path, R_OK)) {
 			static struct strlist *seen;
 
@@ -1260,9 +1260,9 @@ int machines__create_guest_kernel_maps(struct machines *machines)
 					 namelist[i]->d_name);
 				continue;
 			}
-			sprintf(path, "%s/%s/proc/kallsyms",
-				symbol_conf.guestmount,
-				namelist[i]->d_name);
+			snprintf(path, sizeof(path), "%s/%s/proc/kallsyms",
+				 symbol_conf.guestmount,
+				 namelist[i]->d_name);
 			ret = access(path, R_OK);
 			if (ret) {
 				pr_debug("Can't access file %s\n", path);