diff --git a/mozilla/mailnews/mime/src/mimecth.h b/mozilla/mailnews/mime/src/mimecth.h
index b21df0b6f5a..e5b7b654f16 100644
--- a/mozilla/mailnews/mime/src/mimecth.h
+++ b/mozilla/mailnews/mime/src/mimecth.h
@@ -100,7 +100,12 @@
  * mime content handler plugins have a name prefixed by the 
  * MIME_PLUGIN_PREFIX.
  */
+#ifdef XP_WIN
 #define   MIME_PLUGIN_PREFIX      "mimect-"
+#else
+#define   MIME_PLUGIN_PREFIX      "libmimect-"
+#endif 
+
 #define   MIME_PLUGIN_DIR         "mimeplugins"
 
 typedef struct {