diff --git a/base/src/MANIFEST b/base/src/MANIFEST
index 2cdd288700d8..2d703fbca38e 100644
--- a/base/src/MANIFEST
+++ b/base/src/MANIFEST
@@ -22,3 +22,5 @@ nsIInputStream.h
 nsIOutputStream.h
 nsInt64.h
 nsTime.h
+nsStr.h
+nsString2.h