diff --git a/services/spd/trusty/trusty.c b/services/spd/trusty/trusty.c
index 0305143..83c14b4 100644
--- a/services/spd/trusty/trusty.c
+++ b/services/spd/trusty/trusty.c
@@ -420,7 +420,8 @@
 	} else if (instr >> 8 == 0xd53810U || instr >> 16 == 0x9400U) {
 		INFO("trusty: Found 64 bit image\n");
 	} else {
-		NOTICE("trusty: Found unknown image, 0x%x\n", instr);
+		ERROR("trusty: Found unknown image, 0x%x\n", instr);
+		return -1;
 	}
 
 	SET_PARAM_HEAD(ep_info, PARAM_EP, VERSION_1, SECURE | EP_ST_ENABLE);