diff --git a/Marlin/src/HAL/HAL_STM32F4/HAL.h b/Marlin/src/HAL/HAL_STM32F4/HAL.h
index 20d9e0599..b0abf8199 100644
--- a/Marlin/src/HAL/HAL_STM32F4/HAL.h
+++ b/Marlin/src/HAL/HAL_STM32F4/HAL.h
@@ -110,6 +110,7 @@
   #define NUM_SERIAL 1
 #endif
 
+#undef _BV
 #define _BV(b) (1 << (b))
 
 /**
diff --git a/Marlin/src/HAL/HAL_STM32F4/fastio_STM32F4.h b/Marlin/src/HAL/HAL_STM32F4/fastio_STM32F4.h
index e185344dc..d102e64f7 100644
--- a/Marlin/src/HAL/HAL_STM32F4/fastio_STM32F4.h
+++ b/Marlin/src/HAL/HAL_STM32F4/fastio_STM32F4.h
@@ -29,6 +29,7 @@
 #ifndef _FASTIO_STM32F4_H
 #define _FASTIO_STM32F4_H
 
+#undef _BV
 #define _BV(b) (1 << (b))
 
 #define USEABLE_HARDWARE_PWM(p) true
diff --git a/Marlin/src/core/macros.h b/Marlin/src/core/macros.h
index 520c10fc7..df21b0519 100644
--- a/Marlin/src/core/macros.h
+++ b/Marlin/src/core/macros.h
@@ -57,7 +57,7 @@
 #define NANOSECONDS_PER_CYCLE (1000000000.0 / F_CPU)
 
 // Remove compiler warning on an unused variable
-#define UNUSED(x) (void) (x)
+#define UNUSED(x) ((void)(x))
 
 // Macros to make a string from a macro
 #define STRINGIFY_(M) #M