diff --git a/kernel/profile.c b/kernel/profile.c
index c1204e2..54bf5ba 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -52,9 +52,9 @@
 
 int profile_setup(char *str)
 {
-	static char schedstr[] = "schedule";
-	static char sleepstr[] = "sleep";
-	static char kvmstr[] = "kvm";
+	static const char schedstr[] = "schedule";
+	static const char sleepstr[] = "sleep";
+	static const char kvmstr[] = "kvm";
 	int par;
 
 	if (!strncmp(str, sleepstr, strlen(sleepstr))) {