diff --git a/Adafruit_MQTT.cpp b/Adafruit_MQTT.cpp
index da50bce..c31d0c1 100644
--- a/Adafruit_MQTT.cpp
+++ b/Adafruit_MQTT.cpp
@@ -327,7 +327,11 @@ uint16_t Adafruit_MQTT::readFullPacket(uint8_t *buffer, uint16_t maxsize,
   return ((pbuff - buffer) + rlen);
 }
 
+#ifdef ARDUINO_ARCH_ESP32
+const char *Adafruit_MQTT::connectErrorString(int8_t code) {
+#else
 const __FlashStringHelper *Adafruit_MQTT::connectErrorString(int8_t code) {
+#endif
   switch (code) {
   case 1:
     return F(
diff --git a/Adafruit_MQTT.h b/Adafruit_MQTT.h
index 01b373b..f0257f1 100644
--- a/Adafruit_MQTT.h
+++ b/Adafruit_MQTT.h
@@ -166,11 +166,19 @@ class Adafruit_MQTT {
   int8_t connect();
   int8_t connect(const char *user, const char *pass);
 
-  // Return a printable string version of the error code returned by
+#ifdef ARDUINO_ARCH_ESP32
+  // Returns a printable string version of the error code returned by
+  // connect(). Preprocessor due to breaking change within
+  // Arduino ESP32 BSP v2.0.8
+  // see: https://github.com/espressif/arduino-esp32/pull/7941
+  const char *connectErrorString(int8_t code);
+#else
+  // Returns a printable string version of the error code returned by
   // connect(). This returns a __FlashStringHelper*, which points to a
   // string stored in flash, but can be directly passed to e.g.
   // Serial.println without any further processing.
   const __FlashStringHelper *connectErrorString(int8_t code);
+#endif;
 
   // Sends MQTT disconnect packet and calls disconnectServer()
   bool disconnect();
diff --git a/library.properties b/library.properties
index a2dbe7a..2bd2907 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Adafruit MQTT Library
-version=2.5.2
+version=2.5.3
 author=Adafruit
 maintainer=Adafruit <info@adafruit.com>
 sentence=MQTT library that supports the FONA, ESP8266, ESP32, Yun, and generic Arduino Client hardware.