diff --git a/compiler/powerpc/nppcadd.pas b/compiler/powerpc/nppcadd.pas
index b22b4bbc37..965311477e 100644
--- a/compiler/powerpc/nppcadd.pas
+++ b/compiler/powerpc/nppcadd.pas
@@ -1429,6 +1429,8 @@ interface
                     end;
                   subn:
                     begin
+                      if nf_swaped in flags then
+                        swapleftright;
                       exprasmlist.concat(taicpu.op_reg_reg_reg(A_SUB,location.register,
                         left.location.register,right.location.register));
                       exprasmlist.concat(taicpu.op_reg_reg(A_CMPLW,left.location.register,location.register));