diff --git a/BaS_GNU/sources/startcf.c b/BaS_GNU/sources/startcf.c
index 1513c92..a04a5c1 100644
--- a/BaS_GNU/sources/startcf.c
+++ b/BaS_GNU/sources/startcf.c
@@ -2,7 +2,7 @@
 
 void startup(void)
 {
-	asm("\n\t"
+	__asm__ __volatile__ ("\n\t"
 	".extern	_initialize_hardware\n\t"
 	"bra.s	warmstart\n\t"
 	"jmp	___BOOT_FLASH + 8 | ist zugleich reset vector\n\t"
@@ -10,20 +10,20 @@ void startup(void)
 "warmstart:\n\t"
 	"| disable interrupts\n\t"
 	"move.w #0x2700,sr\n\t"
-	);
+	: : : "memory");
 
 	/* Initialize MBAR */
-	asm("MOVE.L	#__MBAR,D0\n\t");
-	asm("MOVEC	D0,MBAR\n\t");
-	asm("MOVE.L	D0,_rt_mbar\n\t");
+	__asm__ __volatile__ ("MOVE.L	#__MBAR,D0\n\t" : : : "memory");
+	__asm__ __volatile__ ("MOVEC	D0,MBAR\n\t" : : : "memory");
+	__asm__ __volatile__ ("MOVE.L	D0,_rt_mbar\n\t" : : : "memory");
 
 	/* mmu off */
-	asm("move.l	#__MMUBAR+1,d0\n\t");
-	asm("movec	d0,MMUBAR");	/* set mmubar */
+	__asm__ __volatile__ ("move.l	#__MMUBAR+1,d0\n\t" : : : "memory");
+	__asm__ __volatile__ ("movec	d0,MMUBAR" : : : "memory");	/* set mmubar */
 
 	MCF_MMU_MMUCR = 0L;	/* MMU off */
 
-	asm(
+	__asm__ __volatile__ (
     "|/* Initialize RAMBARs: locate SRAM and validate it */\n\t"
    	"move.l	#__RAMBAR0 + 0x7,d0\n\t | supervisor only"
    	"movec  d0,RAMBAR0\n\t"
@@ -37,5 +37,5 @@ void startup(void)
  	"nop\n\t"
 	"| initialize any hardware specific issues\n\t"
 	"bra    _initialize_hardware\n\t"
-	);
+	: : : "memory");
 }