diff --git a/Makefile b/Makefile
index 4319f2a..7a5b2b5 100644
--- a/Makefile
+++ b/Makefile
@@ -49,7 +49,7 @@ LDFLAGS+=-Lfxplib/lib/$(BUILD) -lfxp_stm32f0
 LDFLAGS+=-Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group
 
 # build type specific flags
-CFLAGS_debug=-O0 -ggdb #-DDEBUG
+CFLAGS_debug=-O0 -ggdb -DDEBUG
 LDFLAGS_debug=
 
 CFLAGS_release=-Os -ggdb
diff --git a/src/system.c b/src/system.c
index acb6fae..2a35323 100644
--- a/src/system.c
+++ b/src/system.c
@@ -14,37 +14,19 @@ extern funcp_t __fini_array_start, __fini_array_end;
 void main(void);
 caddr_t _sbrk(int incr);
 
-#if 0
-// from libopencm3: lib/stm32/f4/vector_chipset.c
-static void pre_main(void)
-{
-  /* Enable access to Floating-Point coprocessor. */
-  SCB_CPACR |= SCB_CPACR_FULL * (SCB_CPACR_CP10 | SCB_CPACR_CP11);
-}
-#endif
-
 
 void __attribute__ ((naked)) reset_handler(void)
 {
-#ifndef DEBUG
 	volatile unsigned *src;
-#endif
-
 	volatile unsigned *dest;
 
 	funcp_t *fp;
 
-#ifndef DEBUG
 	for (src = &_data_loadaddr, dest = &_data;
 		dest < &_edata;
 		src++, dest++) {
 		*dest = *src;
 	}
-#else
-  // set vector table offset register to the RAM base address
-  SCB_VTOR = 0x20000000;
-  dest = &_edata;
-#endif
 
 	while (dest < &_ebss) {
 		*dest++ = 0;