diff --git a/compiler/x86/cgx86.pas b/compiler/x86/cgx86.pas
index ba654e699f..0debb35b86 100644
--- a/compiler/x86/cgx86.pas
+++ b/compiler/x86/cgx86.pas
@@ -1697,13 +1697,6 @@ unit cgx86;
             end;
           OP_MUL,OP_IMUL:
             begin
-              if not(cs_check_overflow in current_settings.localswitches) and
-                 ispowerof2(int64(a),power) then
-                begin
-                  list.concat(taicpu.op_const_reg(A_SHL,TCgSize2OpSize[size],power,reg));
-                  exit;
-                end;
-
               if op = OP_IMUL then
                 list.concat(taicpu.op_const_reg(A_IMUL,TCgSize2OpSize[size],a,reg))
               else
@@ -1832,13 +1825,6 @@ unit cgx86;
             End;
           OP_MUL,OP_IMUL:
             begin
-              if not(cs_check_overflow in current_settings.localswitches) and
-                 ispowerof2(int64(a),power) then
-                begin
-                  list.concat(taicpu.op_const_ref(A_SHL,TCgSize2OpSize[size],
-                    power,tmpref));
-                  exit;
-                end;
               { can't multiply a memory location directly with a constant }
               if op = OP_IMUL then
                 inherited a_op_const_ref(list,op,size,a,tmpref)