diff --git a/xpcom/build/nsXPComInit.cpp b/xpcom/build/nsXPComInit.cpp
index 03e08b0ff9f..713c34d38e4 100644
--- a/xpcom/build/nsXPComInit.cpp
+++ b/xpcom/build/nsXPComInit.cpp
@@ -129,7 +129,7 @@ NS_GENERIC_FACTORY_CONSTRUCTOR(nsProcess);
 // ds/nsISupportsPrimitives
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsIDImpl)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsStringImpl)
-NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsWStringImpl)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsCStringImpl)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsPRBoolImpl)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsPRUint8Impl)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsPRUint16Impl)