diff --git a/demos/ARMCM3-STM32F103/halconf.h b/demos/ARMCM3-STM32F103/halconf.h
index d784e5233..d36e56ec7 100644
--- a/demos/ARMCM3-STM32F103/halconf.h
+++ b/demos/ARMCM3-STM32F103/halconf.h
@@ -129,7 +129,7 @@
  * @brief   Enables the UART subsystem.
  */
 #if !defined(HAL_USE_UART) || defined(__DOXYGEN__)
-#define HAL_USE_UART                TRUE
+#define HAL_USE_UART                FALSE
 #endif
 
 /**