diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 98a2e92b3168..aa22a5ef5b05 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -5884,7 +5884,7 @@ static int selinux_setprocattr(struct task_struct *p,
 		return error;
 
 	/* Obtain a SID for the context, if one was specified. */
-	if (size && str[1] && str[1] != '\n') {
+	if (size && str[0] && str[0] != '\n') {
 		if (str[size-1] == '\n') {
 			str[size-1] = 0;
 			size--;