diff --git a/chrome/public/nsIChromeRegistry.idl b/chrome/public/nsIChromeRegistry.idl
index 82d40d8fbf33..42e28054e72f 100644
--- a/chrome/public/nsIChromeRegistry.idl
+++ b/chrome/public/nsIChromeRegistry.idl
@@ -26,7 +26,7 @@
 #include "nsIURL.idl"
 #include "nsIEnumerator.idl"
 #include "nsISupportsArray.idl"
-#include "nsIDocShell.idl"
+interface nsIDocShell;
 
 [scriptable, uuid(D8C7D8A1-E84C-11d2-BF87-00105A1B0627)]
 interface nsIChromeRegistry : nsISupports
diff --git a/chrome/src/nsChromeRegistry.cpp b/chrome/src/nsChromeRegistry.cpp
index 347f562cc2fd..14bb68a7d2e3 100644
--- a/chrome/src/nsChromeRegistry.cpp
+++ b/chrome/src/nsChromeRegistry.cpp
@@ -68,6 +68,7 @@
 #include "nsIHTMLStyleSheet.h"
 #include "nsIHTMLContentContainer.h"
 #include "nsIPresShell.h"
+#include "nsIDocShell.h"
 #include "nsIStyleSet.h"
 #include "nsISupportsArray.h"
 #include "nsICSSLoader.h"
diff --git a/rdf/chrome/public/nsIChromeRegistry.idl b/rdf/chrome/public/nsIChromeRegistry.idl
index 82d40d8fbf33..42e28054e72f 100644
--- a/rdf/chrome/public/nsIChromeRegistry.idl
+++ b/rdf/chrome/public/nsIChromeRegistry.idl
@@ -26,7 +26,7 @@
 #include "nsIURL.idl"
 #include "nsIEnumerator.idl"
 #include "nsISupportsArray.idl"
-#include "nsIDocShell.idl"
+interface nsIDocShell;
 
 [scriptable, uuid(D8C7D8A1-E84C-11d2-BF87-00105A1B0627)]
 interface nsIChromeRegistry : nsISupports
diff --git a/rdf/chrome/src/nsChromeRegistry.cpp b/rdf/chrome/src/nsChromeRegistry.cpp
index 347f562cc2fd..14bb68a7d2e3 100644
--- a/rdf/chrome/src/nsChromeRegistry.cpp
+++ b/rdf/chrome/src/nsChromeRegistry.cpp
@@ -68,6 +68,7 @@
 #include "nsIHTMLStyleSheet.h"
 #include "nsIHTMLContentContainer.h"
 #include "nsIPresShell.h"
+#include "nsIDocShell.h"
 #include "nsIStyleSet.h"
 #include "nsISupportsArray.h"
 #include "nsICSSLoader.h"