diff --git a/libraries/SdFat-1.1.0/src/SdFatConfig.h b/libraries/SdFat-1.1.0/src/SdFatConfig.h
index e6f1d858..81ae5a9b 100644
--- a/libraries/SdFat-1.1.0/src/SdFatConfig.h
+++ b/libraries/SdFat-1.1.0/src/SdFatConfig.h
@@ -99,8 +99,8 @@
 #elif defined(__arm__)
 // ARM gcc defines open flags.
 #define USE_FCNTL_H 1
-#else  // defined(__AVR__)
-#define USE_FCNTL_H 0
+#else  // defined(__AVR__) //Like ESP32
+#define USE_FCNTL_H 1
 #endif  // defined(__AVR__)
 //------------------------------------------------------------------------------
 /**