diff --git a/src/M5StickCPlus.h b/src/M5StickCPlus.h
index c116405..3a70f9e 100644
--- a/src/M5StickCPlus.h
+++ b/src/M5StickCPlus.h
@@ -116,7 +116,7 @@ extern M5StickCPlus M5;
 #define IMU Imu
 
 #else
-#error “This library only supports boards with ESP32 processor.”
+#error "This library only supports boards with ESP32 processor."
 #endif
 
-#endif
\ No newline at end of file
+#endif