diff --git a/arch/nt64/src/syscall_disp.c b/arch/nt64/src/syscall_disp.c
index cb9655d..3369ca0 100644
--- a/arch/nt64/src/syscall_disp.c
+++ b/arch/nt64/src/syscall_disp.c
@@ -7,7 +7,7 @@ extern struct __psx_vtbl * __psx_vtbl;
 
 void __unmapself(void * base, size_t size)
 {
-	__psx_vtbl->unmapself(base,size);
+	__psx_vtbl->unmapself(base,(void *)size);
 }
 
 uintptr_t __syscall_disp(long n,