diff --git a/mailnews/addrbook/public/nsIAbDirectory.idl b/mailnews/addrbook/public/nsIAbDirectory.idl
index c2ab8cca269..71f9367249a 100644
--- a/mailnews/addrbook/public/nsIAbDirectory.idl
+++ b/mailnews/addrbook/public/nsIAbDirectory.idl
@@ -50,6 +50,10 @@
 #define kPersonalAddressbookUri    "moz-abmdbdirectory://abook.mab"
 #define kCollectedAddressbook      "history.mab"
 #define kCollectedAddressbookUri   "moz-abmdbdirectory://history.mab"
+
+#define kABFileName_PreviousSuffix ".na2" /* final v2 address book format */
+#define kABFileName_PreviousSuffixLen 4
+#define kABFileName_CurrentSuffix ".mab"  /* v3 address book extension */
 %}
 
 // used for when creating new directories
diff --git a/mailnews/addrbook/src/nsDirPrefs.h b/mailnews/addrbook/src/nsDirPrefs.h
index 0fb3d291cf1..f1bcd2281fb 100644
--- a/mailnews/addrbook/src/nsDirPrefs.h
+++ b/mailnews/addrbook/src/nsDirPrefs.h
@@ -47,9 +47,6 @@ class nsVoidArray;
 #define PREF_LDAP_VERSION_NAME     "ldap_2.version"
 #define PREF_LDAP_SERVER_TREE_NAME "ldap_2.servers"
 
-#define kABFileName_PreviousSuffix ".na2" /* final v2 address book format */
-#define kABFileName_PreviousSuffixLen 4
-#define kABFileName_CurrentSuffix ".mab"  /* v3 address book extension */
 #define kMainLdapAddressBook "ldap.mab"   /* v3 main ldap address book file */
 
 /* DIR_Server.dirType */
diff --git a/mailnews/extensions/palmsync/src/nsAbPalmSync.h b/mailnews/extensions/palmsync/src/nsAbPalmSync.h
index 9fba6760b81..c099e04ccaa 100644
--- a/mailnews/extensions/palmsync/src/nsAbPalmSync.h
+++ b/mailnews/extensions/palmsync/src/nsAbPalmSync.h
@@ -46,10 +46,6 @@
 #include "nsILocalFile.h"
 #include "nsIAbDirectory.h"
 
-#define kABFileName_PreviousSuffixLen 4
-#define kABFileName_PreviousSuffix ".na2" /* final v2 address book format */
-
-
 class nsAbPalmHotSync
 {
 public: