diff --git a/collects/compiler/embed-unit.rkt b/collects/compiler/embed-unit.rkt
index 9339f77661..3202c00b92 100644
--- a/collects/compiler/embed-unit.rkt
+++ b/collects/compiler/embed-unit.rkt
@@ -175,14 +175,7 @@
                              creator
                              
                              "CFBundleIdentifier" 
-                             (format "org.racket-lang.~a~a" 
-                                     (path->string name)
-                                     (if (fixnum? (expt 2 32))
-                                         ;; Add a "-64" suffix for 64-bit, because Lion seems
-                                         ;; to get confused by 32-bit and 64-bit apps with the same
-                                         ;; id (see PR 12135)
-                                         "-64"
-                                         "")))]
+                             (format "org.racket-lang.~a" (path->string name)))]
                  [new-plist (if uti-exports
                                 (plist-replace
                                  new-plist
diff --git a/src/mac/osx_appl.rkt b/src/mac/osx_appl.rkt
index c5ad175439..b2d2e26520 100644
--- a/src/mac/osx_appl.rkt
+++ b/src/mac/osx_appl.rkt
@@ -86,11 +86,7 @@
 	   (assoc-pair "CFBundleExecutable"
 		       ,app-name)
 	   (assoc-pair "CFBundleIdentifier"
-		       ,(format "org.racket-lang.~a~a" app-name
-                                (if (fixnum? (expt 2 32))
-                                    ;; See comment on similar code in compiler/embed-unit:
-                                    "-64"
-                                    "")))
+		       ,(format "org.racket-lang.~a" app-name))
 	   ,@(if app?
 		 `((assoc-pair "CFBundleIconFile"
 			       ,app-name))