diff --git a/src/core/config/openthread-core-config-check.h b/src/core/config/openthread-core-config-check.h
index 4cacac022..7f17a0c7c 100644
--- a/src/core/config/openthread-core-config-check.h
+++ b/src/core/config/openthread-core-config-check.h
@@ -97,7 +97,7 @@
 #endif
 
 #ifdef OPENTHREAD_ENABLE_MTD_NETWORK_DIAGNOSTIC
-#error "OPENTHREAD_ENABLE_MTD_NETWORK_DIAGNOSTIC was replaces by OPENTHREAD_CONFIG_TMF_NETWORK_DIAG_MTD_ENABLE."
+#error "OPENTHREAD_ENABLE_MTD_NETWORK_DIAGNOSTIC was replaced by OPENTHREAD_CONFIG_TMF_NETWORK_DIAG_MTD_ENABLE."
 #endif
 
 #ifdef OPENTHREAD_ENABLE_APPLICATION_COAP_SECURE