diff --git a/FreeRTOS/Source/portable/MSVC-MingW/portmacro.h b/FreeRTOS/Source/portable/MSVC-MingW/portmacro.h
index 3666c03ea7..7f6548193e 100644
--- a/FreeRTOS/Source/portable/MSVC-MingW/portmacro.h
+++ b/FreeRTOS/Source/portable/MSVC-MingW/portmacro.h
@@ -107,7 +107,7 @@ typedef unsigned long UBaseType_t;
 #define portTICK_PERIOD_MS			( ( TickType_t ) 1000 / configTICK_RATE_HZ )
 
 
-#if defined( __x86_64_ _) || defined( _M_X64 )
+#if defined( __x86_64__) || defined( _M_X64 )
 	#define portBYTE_ALIGNMENT		8
 #else
 	#define portBYTE_ALIGNMENT		4