diff --git a/Source/portable/BCC/16BitDOS/PC/prtmacro.h b/Source/portable/BCC/16BitDOS/PC/prtmacro.h
index 7b74af5ed2..103417f713 100644
--- a/Source/portable/BCC/16BitDOS/PC/prtmacro.h
+++ b/Source/portable/BCC/16BitDOS/PC/prtmacro.h
@@ -97,6 +97,7 @@
 #define portTICK_RATE_MS		( ( portTickType ) 1000 / configTICK_RATE_HZ )		
 #define portTICKS_PER_DOS_TICK	( ( unsigned portSHORT ) ( ( ( portDOUBLE ) configTICK_RATE_HZ / portDOS_TICK_RATE ) + 0.5 ) )
 #define portINITIAL_SW			( ( portSTACK_TYPE ) 0x0202 )	/* Start the tasks with interrupts enabled. */
+#define portBYTE_ALIGNMENT		( 2 )
 /*-----------------------------------------------------------*/
 
 /* Compiler specifics. */
diff --git a/Source/portable/oWatcom/16BitDOS/PC/portmacro.h b/Source/portable/oWatcom/16BitDOS/PC/portmacro.h
index 7457de95bf..0178a8c46a 100644
--- a/Source/portable/oWatcom/16BitDOS/PC/portmacro.h
+++ b/Source/portable/oWatcom/16BitDOS/PC/portmacro.h
@@ -106,6 +106,7 @@ void portENABLE_INTERRUPTS( void );
 #define portTICK_RATE_MS        ( ( portTickType ) 1000 / configTICK_RATE_HZ )
 #define portTICKS_PER_DOS_TICK	( ( unsigned portSHORT ) ( ( ( portDOUBLE ) configTICK_RATE_HZ / portDOS_TICK_RATE ) + 0.5 ) )
 #define portINITIAL_SW			( ( portSTACK_TYPE ) 0x0202 )	/* Start the tasks with interrupts enabled. */
+#define portBYTE_ALIGNMENT		( 2 )
 /*-----------------------------------------------------------*/
 
 /* Compiler specifics. */