diff --git a/docshell/base/nsDocShell.cpp b/docshell/base/nsDocShell.cpp
index 0e9712f2b16f..0ebf93a516a7 100644
--- a/docshell/base/nsDocShell.cpp
+++ b/docshell/base/nsDocShell.cpp
@@ -109,7 +109,6 @@ NS_IMPL_QUERY_HEAD(nsDocShell)
    NS_IMPL_QUERY_BODY(nsIBaseWindow)
    NS_IMPL_QUERY_BODY(nsIScrollable)
    NS_IMPL_QUERY_BODY(nsITextScroll)
-   NS_IMPL_QUERY_BODY(nsICapabilities)
 //   NS_IMPL_QUERY_BODY(nsIInterfaceRequestor)
 NS_IMPL_QUERY_TAIL(nsIDocShell)
 
diff --git a/docshell/base/nsDocShell.h b/docshell/base/nsDocShell.h
index 9bd0dcd35a64..919dc3c085fd 100644
--- a/docshell/base/nsDocShell.h
+++ b/docshell/base/nsDocShell.h
@@ -73,7 +73,6 @@ friend class nsDSURIContentListener;
 public:
    NS_DECL_ISUPPORTS
 
-   NS_DECL_NSICAPABILITIES
    NS_DECL_NSIDOCSHELL
    NS_DECL_NSIDOCSHELLEDIT
    NS_DECL_NSIDOCSHELLFILE