diff --git a/nimble/host/src/ble_hs_hci.c b/nimble/host/src/ble_hs_hci.c
index 59dda4f6e..8a143d933 100644
--- a/nimble/host/src/ble_hs_hci.c
+++ b/nimble/host/src/ble_hs_hci.c
@@ -106,7 +106,7 @@
 
 struct err_code {
     int error_code;
-    char *msg;
+    const char *msg;
 };
 
 static struct err_code err_code_list[] = {