diff --git a/DAG.pas b/DAG.pas
index 95cb44e..fd88103 100644
--- a/DAG.pas
+++ b/DAG.pas
@@ -1607,7 +1607,7 @@ case op^.opcode of			{check for optimizations of this node}
          else if op^.right^.optype in [cgByte, cgUByte, cgWord, cgUWord] then begin
             if op^.right^.q = 1 then
                if op^.left^.opcode in
-         	  [pc_and,pc_ior,pc_neq,pc_equ,pc_geq,pc_leq,pc_les,pc_grt]
+         	  [pc_and,pc_ior,pc_neq,pc_equ,pc_geq,pc_leq,pc_les,pc_grt,pc_not]
                   then begin
                   opv := op^.left;
                   opv^.next := op^.next;
@@ -1616,7 +1616,7 @@ case op^.opcode of			{check for optimizations of this node}
          else if op^.right^.optype in [cgLong, cgULong] then begin
             if op^.right^.lval = 1 then
                if op^.left^.opcode in
-         	  [pc_and,pc_ior,pc_neq,pc_equ,pc_geq,pc_leq,pc_les,pc_grt]
+         	  [pc_and,pc_ior,pc_neq,pc_equ,pc_geq,pc_leq,pc_les,pc_grt,pc_not]
                   then begin
                   opv := op^.left;
                   opv^.next := op^.next;
@@ -2126,7 +2126,7 @@ case op^.opcode of			{check for optimizations of this node}
          else if op^.right^.optype in [cgByte, cgUByte, cgWord, cgUWord] then begin
             if op^.right^.q = 0 then
                if op^.left^.opcode in
-         	  [pc_and,pc_ior,pc_neq,pc_equ,pc_geq,pc_leq,pc_les,pc_grt]
+         	  [pc_and,pc_ior,pc_neq,pc_equ,pc_geq,pc_leq,pc_les,pc_grt,pc_not]
                   then begin
                   opv := op^.left;
                   opv^.next := op^.next;
@@ -2135,7 +2135,7 @@ case op^.opcode of			{check for optimizations of this node}
          else if op^.right^.optype in [cgLong, cgULong] then begin
             if op^.right^.lval = 0 then
                if op^.left^.opcode in
-         	  [pc_and,pc_ior,pc_neq,pc_equ,pc_geq,pc_leq,pc_les,pc_grt]
+         	  [pc_and,pc_ior,pc_neq,pc_equ,pc_geq,pc_leq,pc_les,pc_grt,pc_not]
                   then begin
                   opv := op^.left;
                   opv^.next := op^.next;