diff --git a/lib/syslib/sys_fork.c b/lib/syslib/sys_fork.c
index 3b5a5e01f..fb0117d5f 100755
--- a/lib/syslib/sys_fork.c
+++ b/lib/syslib/sys_fork.c
@@ -13,7 +13,7 @@ struct mem_map *map_ptr;
 
   m.PR_ENDPT = parent;
   m.PR_SLOT = child;
-  m.PR_MEM_PTR = map_ptr;
+  m.PR_MEM_PTR = (char *) map_ptr;
   r = _taskcall(SYSTASK, SYS_FORK, &m);
   *child_endpoint = m.PR_ENDPT;
   return r;
diff --git a/lib/syslib/sys_vsafecopy.c b/lib/syslib/sys_vsafecopy.c
index 343dd0f6d..e89f19a5e 100644
--- a/lib/syslib/sys_vsafecopy.c
+++ b/lib/syslib/sys_vsafecopy.c
@@ -9,7 +9,7 @@ PUBLIC int sys_vsafecopy(struct vscp_vec *vec, int els)
 
   message copy_mess;
 
-  copy_mess.VSCP_VEC_ADDR = vec;
+  copy_mess.VSCP_VEC_ADDR = (char *) vec;
   copy_mess.VSCP_VEC_SIZE = els;
 
   return(_taskcall(SYSTASK, SYS_VSAFECOPY, &copy_mess));
diff --git a/lib/sysutil/kputc.c b/lib/sysutil/kputc.c
index 13226e3af..47309b50e 100644
--- a/lib/sysutil/kputc.c
+++ b/lib/sysutil/kputc.c
@@ -48,7 +48,8 @@ int c;
 		 * print buffer forever. (So buffer can't be on stack!)
 		 */
 		for(p = 0; procs[p] != NONE; p++) {
-			printgrants[p] = cpf_grant_direct(procs[p], print_buf,
+			printgrants[p] = cpf_grant_direct(procs[p],
+				(vir_bytes) print_buf,
 				sizeof(print_buf), CPF_READ);
 		}
 	}
@@ -58,7 +59,7 @@ int c;
 		m.DIAG_BUF_COUNT = buf_count;
 		if(GRANT_VALID(printgrants[p])) {
 			m.m_type = DIAGNOSTICS_S;
-			m.DIAG_PRINT_BUF_G = printgrants[p];
+			m.DIAG_PRINT_BUF_G = (char *) printgrants[p];
 		} else {
 			m.m_type = DIAGNOSTICS;
 			m.DIAG_PRINT_BUF_G = print_buf;