diff --git a/src/WebAPIService.cpp b/src/WebAPIService.cpp
index 3aee6c42a..77d13de98 100644
--- a/src/WebAPIService.cpp
+++ b/src/WebAPIService.cpp
@@ -103,7 +103,7 @@ void WebAPIService::webAPIService(AsyncWebServerRequest * request) {
     if (json.size()) {
         std::string buffer2;
         serializeJson(doc, buffer2);
-        EMSESP::logger().debug("json (max 255 chars): %s", buffer2);
+        EMSESP::logger().debug("json (max 255 chars): %s", buffer2.c_str());
     }
 #endif
 
diff --git a/src/mqtt.cpp b/src/mqtt.cpp
index 8e974be39..9be2cd84a 100644
--- a/src/mqtt.cpp
+++ b/src/mqtt.cpp
@@ -633,7 +633,7 @@ void Mqtt::publish_ha(const std::string & topic, const JsonObject & payload) {
     serializeJson(payload, payload_text); // convert json to string
 
 #if defined(EMSESP_STANDALONE)
-    LOG_DEBUG(F("Publishing HA topic=%s, payload=%s"), topic, payload_text.c_str());
+    LOG_DEBUG(F("Publishing HA topic=%s, payload=%s"), topic.c_str(), payload_text.c_str());
 #else
     LOG_DEBUG(F("Publishing HA topic %s"), topic.c_str());
 #endif