diff --git a/lib/lexer.js b/lib/lexer.js
index 3f81a3ef..ac8b63eb 100644
--- a/lib/lexer.js
+++ b/lib/lexer.js
@@ -563,7 +563,7 @@
     };
     Lexer.prototype.unfinished = function() {
       var prev, value;
-      return (prev = last(this.tokens, 1)) && prev[0] !== '.' && (value = this.value()) && NO_NEWLINE.test(value) && !CODE.test(value) && !ASSIGNED.test(this.chunk);
+      return (prev = last(this.tokens, 1)) && prev[0] !== '.' && (value = this.value()) && !value.reserved && NO_NEWLINE.test(value) && !CODE.test(value) && !ASSIGNED.test(this.chunk);
     };
     Lexer.prototype.escapeLines = function(str, heredoc) {
       return str.replace(MULTILINER, heredoc ? '\\n' : '');
diff --git a/src/lexer.coffee b/src/lexer.coffee
index a252f76f..a6c626df 100644
--- a/src/lexer.coffee
+++ b/src/lexer.coffee
@@ -486,8 +486,8 @@ exports.Lexer = class Lexer
   # Are we in the midst of an unfinished expression?
   unfinished: ->
     (prev  = last @tokens, 1) and prev[0] isnt '.' and
-    (value = @value()) and NO_NEWLINE.test(value) and not CODE.test(value) and
-    not ASSIGNED.test(@chunk)
+      (value = @value()) and not value.reserved and
+      NO_NEWLINE.test(value) and not CODE.test(value) and not ASSIGNED.test(@chunk)
 
   # Converts newlines for string literals.
   escapeLines: (str, heredoc) ->
diff --git a/test/test_if.coffee b/test/test_if.coffee
index 4fea51b3..42ba54b7 100644
--- a/test/test_if.coffee
+++ b/test/test_if.coffee
@@ -135,3 +135,12 @@ ok result is 70
 # Issue #738
 func = if true then -> 1
 eq func(), 1
+
+
+# Issue #748. Trailing reserved identifiers.
+obj = delete: true
+
+result = if obj.delete
+  101
+
+ok result is 101