diff --git a/xpcom/build/nsXPComInit.cpp b/xpcom/build/nsXPComInit.cpp
index bda82c648a9..f7082e06c56 100644
--- a/xpcom/build/nsXPComInit.cpp
+++ b/xpcom/build/nsXPComInit.cpp
@@ -47,6 +47,7 @@
 #include "nsPersistentProperties.h"
 #include "nsScriptableInputStream.h"
 #include "nsBinaryStream.h"
+#include "nsStorageStream.h"
 
 #include "nsMemoryImpl.h"
 #include "nsDebugImpl.h"
@@ -178,6 +179,7 @@ NS_GENERIC_FACTORY_CONSTRUCTOR(nsTimerImpl)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsTimerManager)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsBinaryOutputStream)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsBinaryInputStream)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsStorageStream)
 
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsVariant)
 
@@ -290,6 +292,7 @@ static const nsModuleComponentInfo components[] = {
     COMPONENT(SCRIPTABLEINPUTSTREAM, nsScriptableInputStream::Create),
     COMPONENT(BINARYINPUTSTREAM, nsBinaryInputStreamConstructor),
     COMPONENT(BINARYOUTPUTSTREAM, nsBinaryOutputStreamConstructor),
+    COMPONENT(STORAGESTREAM, nsStorageStreamConstructor),
 
 #define NS_PROPERTIES_CLASSNAME  "Properties"
     COMPONENT(PROPERTIES, nsProperties::Create),
diff --git a/xpcom/io/nsStorageStream.h b/xpcom/io/nsStorageStream.h
index 59f22fa2213..4a1f68f2d02 100644
--- a/xpcom/io/nsStorageStream.h
+++ b/xpcom/io/nsStorageStream.h
@@ -34,6 +34,17 @@
 #include "nsIOutputStream.h"
 #include "nsMemory.h"
 
+#define NS_STORAGESTREAM_CID                       \
+{ /* 669a9795-6ff7-4ed4-9150-c34ce2971b63 */       \
+  0x669a9795,                                      \
+  0x6ff7,                                          \
+  0x4ed4,                                          \
+  {0x91, 0x50, 0xc3, 0x4c, 0xe2, 0x97, 0x1b, 0x63} \
+}
+
+#define NS_STORAGESTREAM_CONTRACTID "@mozilla.org/storagestream;1"
+#define NS_STORAGESTREAM_CLASSNAME "Storage Stream"
+
 class nsSegmentedBuffer;
 
 class nsStorageStream : public nsIStorageStream,