diff --git a/bootstrap/vita/sbrk.c b/bootstrap/vita/sbrk.c
index e960060b66..a36d56cfd7 100644
--- a/bootstrap/vita/sbrk.c
+++ b/bootstrap/vita/sbrk.c
@@ -1,6 +1,6 @@
 #include <errno.h>
 #include <reent.h>
-
+#include "../../defines/psp_defines.h"
 static int _newlib_heap_memblock;
 static unsigned _newlib_heap_size;
 static char *_newlib_heap_base, *_newlib_heap_end, *_newlib_heap_cur;
@@ -11,19 +11,19 @@ static int _newlib_vm_memblock;
 extern int _newlib_vm_size_user __attribute__((weak));
 
 void * _sbrk_r(struct _reent *reent, ptrdiff_t incr) {
-	if (sceKernelLockLwMutex(_newlib_sbrk_mutex, 1, 0) < 0)
+	if (sceKernelLockLwMutex((struct SceKernelLwMutexWork*)_newlib_sbrk_mutex, 1, 0) < 0)
 		goto fail;
 	if (!_newlib_heap_base || _newlib_heap_cur + incr >= _newlib_heap_end) {
-		sceKernelUnlockLwMutex(_newlib_sbrk_mutex, 1);
+		sceKernelUnlockLwMutex((struct SceKernelLwMutexWork*)_newlib_sbrk_mutex, 1);
 fail:
 		reent->_errno = ENOMEM;
-		return -1;
+		return (void*)-1;
 	}
 
 	char *prev_heap_end = _newlib_heap_cur;
 	_newlib_heap_cur += incr;
 
-	sceKernelUnlockLwMutex(_newlib_sbrk_mutex, 1);
+	sceKernelUnlockLwMutex((struct SceKernelLwMutexWork*)_newlib_sbrk_mutex, 1);
 	return (void*) prev_heap_end;
 }
 
@@ -35,7 +35,7 @@ void _init_vita_heap(void) {
 	  _newlib_vm_memblock = sceKernelAllocMemBlockForVM("code", _newlib_vm_size_user);
 
 	  if (_newlib_vm_memblock < 0){
-	    sceClibPrintf("sceKernelAllocMemBlockForVM failed\n");
+	    //sceClibPrintf("sceKernelAllocMemBlockForVM failed\n");
 			goto failure;
 		}
 	}else{
@@ -44,15 +44,11 @@ void _init_vita_heap(void) {
 	
   
 	// Create a mutex to use inside _sbrk_r
-	if (sceKernelCreateLwMutex(_newlib_sbrk_mutex, "sbrk mutex", 0, 0, 0) < 0) {
+	if (sceKernelCreateLwMutex((struct SceKernelLwMutexWork*)_newlib_sbrk_mutex, "sbrk mutex", 0, 0, 0) < 0) {
 		goto failure;
 	}
-	if (&_newlib_heap_size_user != NULL) {
-		_newlib_heap_size = _newlib_heap_size_user;
-	} else {
-		// Create a memblock for the heap memory, 32MB
-		_newlib_heap_size = 32 * 1024 * 1024;
-	}
+	
+	_newlib_heap_size = _newlib_heap_size_user;
 	
 	_newlib_heap_size -= _newlib_vm_size; 
 	
@@ -60,7 +56,7 @@ void _init_vita_heap(void) {
 	if (_newlib_heap_memblock < 0) {
 		goto failure;
 	}
-	if (sceKernelGetMemBlockBase(_newlib_heap_memblock, &_newlib_heap_base) < 0) {
+	if (sceKernelGetMemBlockBase(_newlib_heap_memblock, (void**)&_newlib_heap_base) < 0) {
 		goto failure;
 	}
 	_newlib_heap_end = _newlib_heap_base + _newlib_heap_size;
@@ -81,7 +77,7 @@ int getVMBlock(){
 void _free_vita_heap(void) {
 	
 	// Destroy the sbrk mutex
-	sceKernelDeleteLwMutex(_newlib_sbrk_mutex);
+	sceKernelDeleteLwMutex((struct SceKernelLwMutexWork*)_newlib_sbrk_mutex);
 
 	// Free the heap memblock to avoid memory leakage.
 	sceKernelFreeMemBlock(_newlib_heap_memblock);