diff --git a/lib/compress.js b/lib/compress.js
index 4636716e..17bebf77 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2267,16 +2267,16 @@ merge(Compressor.prototype, {
     OPT(AST_Infinity, function (self, compressor) {
         return make_node(AST_Binary, self, {
             operator : '/',
-            left     : make_node(AST_Number, null, {value: 1}),
-            right    : make_node(AST_Number, null, {value: 0})
+            left     : make_node(AST_Number, self, {value: 1}),
+            right    : make_node(AST_Number, self, {value: 0})
         });
     });
 
     OPT(AST_NaN, function (self, compressor) {
         return make_node(AST_Binary, self, {
             operator : '/',
-            left     : make_node(AST_Number, null, {value: 0}),
-            right    : make_node(AST_Number, null, {value: 0})
+            left     : make_node(AST_Number, self, {value: 0}),
+            right    : make_node(AST_Number, self, {value: 0})
         });
     });