diff --git a/src/parse.c b/src/parse.c
index 5367c3aa6ba0..719712d204a6 100644
--- a/src/parse.c
+++ b/src/parse.c
@@ -2891,14 +2891,13 @@ Dsymbols *Parser::parseDeclarations(StorageClass storage_class, unsigned char *c
                 addComment(s, comment);
                 return a;
             }
-#if 0
             /* Look for:
-             *  alias this = identifier;
+             *  alias this : identifier;
              */
-            if (token.value == TOKthis && peekNext() == TOKassign && peekNext2() == TOKidentifier)
+            if (token.value == TOKthis && peekNext() == TOKcolon && peekNext2() == TOKidentifier)
             {
                 check(TOKthis);
-                check(TOKassign);
+                check(TOKcolon);
                 AliasThis *s = new AliasThis(loc, token.ident);
                 nextToken();
                 check(TOKsemicolon);
@@ -2907,7 +2906,6 @@ Dsymbols *Parser::parseDeclarations(StorageClass storage_class, unsigned char *c
                 addComment(s, comment);
                 return a;
             }
-#endif
             /* Look for:
              *  alias identifier = type;
              */
diff --git a/test/compilable/aliasdecl.d b/test/compilable/aliasdecl.d
index cb56e987d3e0..40e6bac7f7cc 100644
--- a/test/compilable/aliasdecl.d
+++ b/test/compilable/aliasdecl.d
@@ -24,12 +24,12 @@ void main()
     static assert(is(Y4 == void delegate() const));
     static assert(is(Y5.Type == int));
 
- /+ struct S
+    struct S
     {
         int value;
-        alias this = value;
+        alias this : value;
     }
     auto s = S(10);
     int n = s;
-    assert(n == 10); +/
+    assert(n == 10);
 }