diff --git a/platforms/qemu_integratorcp/syscalls.c b/platforms/qemu_integratorcp/syscalls.c
index 97295a7..1467d58 100644
--- a/platforms/qemu_integratorcp/syscalls.c
+++ b/platforms/qemu_integratorcp/syscalls.c
@@ -55,12 +55,13 @@ int _read(int file, char *ptr, int len) {
 
 char *heap_end = 0;
 caddr_t _sbrk(int incr) {
- extern char heap_low; /* Defined by the linker */
+ extern char end; /* Defined by the linker */
  extern char heap_top; /* Defined by the linker */
+ static char *heap_end;
  char *prev_heap_end;
 
  if (heap_end == 0) {
-  heap_end = &heap_low;
+  heap_end = &end;
  }
  prev_heap_end = heap_end;
 
diff --git a/platforms/qemu_integratorcp/system.ld b/platforms/qemu_integratorcp/system.ld
index 4de00a5..6ee3586 100644
--- a/platforms/qemu_integratorcp/system.ld
+++ b/platforms/qemu_integratorcp/system.ld
@@ -57,11 +57,6 @@ SECTIONS
 	_end_bss = .;
 	__bss_end__ = . ;
 
-	. = ALIGN(8);
-	heap_low = .; /* for _sbrk */
-	. = . + 0x10000; /* 64kB of heap memory */
-	heap_top = .; /* for _sbrk */
-
 	. = ALIGN(256);
 	
 	.stack : {
@@ -95,3 +90,5 @@ SECTIONS
 __end__ = .;
 _end = .;
 PROVIDE(end = .);
+
+heap_top = ORIGIN(sram) + LENGTH(sram) - 4;