diff --git a/compiler/mips/cgcpu.pas b/compiler/mips/cgcpu.pas
index a916141aac..ba9c087d6b 100644
--- a/compiler/mips/cgcpu.pas
+++ b/compiler/mips/cgcpu.pas
@@ -550,6 +550,10 @@ begin
         list.concat(taicpu.op_reg_reg_const(A_ANDI, reg2, reg1, $ff));
       OS_16:
         list.concat(taicpu.op_reg_reg_const(A_ANDI, reg2, reg1, $ffff));
+{$ifdef cpu64bitalu}
+      OS_64,
+      OS_S64,
+{$endif cpu64bitalu}
       OS_32,
       OS_S32:
         done:=false;
@@ -1237,8 +1241,12 @@ begin
   case size of
     OS_32:  asmop:=A_MULTU;
     OS_S32: asmop:=A_MULT;
+{$ifdef cpu64bitalu}
+    OS_64:  asmop:=A_DMULTU;
+    OS_S64: asmop:=A_DMULT;
+{$endif cpu64bitalu}
   else
-    InternalError(2014060802);
+    InternalError(2022020901);
   end;
   list.concat(taicpu.op_reg_reg(asmop,src1,src2));
   if (dstlo<>NR_NO) then
diff --git a/rtl/mips64/cpuh.inc b/rtl/mips64/cpuh.inc
new file mode 100644
index 0000000000..e3f3caf416
--- /dev/null
+++ b/rtl/mips64/cpuh.inc
@@ -0,0 +1,15 @@
+{
+
+    This file is part of the Free Pascal run time library.
+    Copyright (c) 2016 by the Free Pascal development team.
+
+    CPU specific system unit header file
+
+    See the file COPYING.FPC, included in this distribution,
+    for details about the copyright.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+ **********************************************************************}