diff --git a/modules/libreg/src/Makefile.in b/modules/libreg/src/Makefile.in
index f5f27b8c9249..d2be7745b483 100644
--- a/modules/libreg/src/Makefile.in
+++ b/modules/libreg/src/Makefile.in
@@ -47,6 +47,11 @@ MODULE		= libreg
 LIBRARY_NAME	= mozreg_s
 DIST_INSTALL = 1
 
+# MacOSX requires the MoreFiles module
+ifeq ($(OS_ARCH),Darwin)
+REQUIRES = macmorefiles
+endif
+
 CSRCS		= $(MODULES_LIBREG_SRC_LCSRCS) nr_bufio.c
 
 BIN_SRCS	= VerReg.c reg.c vr_stubs.c
@@ -65,6 +70,10 @@ USE_STATIC_LIBS = 1
 
 SDK_LIBRARY = $(LIBRARY)
 
+ifeq (cocoa,$(MOZ_WIDGET_TOOLKIT))
+SHARED_LIBRARY_LIBS += $(DEPTH)/xpcom/MoreFiles/libmacmorefiles_s.a
+endif
+
 include $(topsrcdir)/config/config.mk
 
 DEFINES         += -DUSE_BUFFERED_REGISTRY_IO	
diff --git a/modules/libreg/src/reg.c b/modules/libreg/src/reg.c
index 4bf9cb4390e2..d6df1c02a13d 100644
--- a/modules/libreg/src/reg.c
+++ b/modules/libreg/src/reg.c
@@ -151,11 +151,16 @@ static int32    regStartCount = 0;
 char            *globalRegName = NULL;
 static char     *user_name = NULL;
 
+
+
+
 #ifdef XP_MACOSX
 
 void nr_MacAliasFromPath(const char * fileName, void ** alias, int32 * length);
 char * nr_PathFromMacAlias(const void * alias, uint32 aliasLength);
 
+#include "MoreFilesX.h"
+
 static void copyCStringToPascal(Str255 dest, const char *src)
 {
     size_t copyLen = strlen(src);
@@ -181,9 +186,9 @@ static OSErr isFileInTrash(FSRef *fsRef, PRBool *inTrash)
         err = FSFindFolder(catalogInfo.volume, kTrashFolderType, false, &trashFSRef);
         if (err == noErr)
         {
+            /* FSRefGetParentRef returns noErr and a zeroed FSRef when it reaches the top */
             for (currFSRef = *fsRef;
-                 (FSGetCatalogInfo(&currFSRef, kFSCatInfoNodeID, NULL, NULL, NULL, &parentFSRef) == noErr &&
-                  FSGetCatalogInfo(&parentFSRef, kFSCatInfoNone, NULL, NULL, NULL, NULL) == noErr);
+                 (FSGetParentRef(&currFSRef, &parentFSRef) == noErr && FSRefValid(&parentFSRef));
                  currFSRef = parentFSRef)
             {
                 if (FSCompareFSRefs(&parentFSRef, &trashFSRef) == noErr)
diff --git a/modules/libreg/standalone/Makefile.in b/modules/libreg/standalone/Makefile.in
index d58010eb4e19..24eaffbb2a52 100644
--- a/modules/libreg/standalone/Makefile.in
+++ b/modules/libreg/standalone/Makefile.in
@@ -47,6 +47,11 @@ include $(srcdir)/../src/objs.mk
 MODULE		= libreg
 LIBRARY_NAME	= mozregsa_s
 
+# MacOSX requires the MoreFiles module
+ifeq ($(OS_ARCH),Darwin)
+REQUIRES = macmorefiles
+endif
+
 ifeq ($(OS_ARCH),WINNT)
 USE_STATIC_LIBS = 1
 endif