diff --git a/docshell/base/nsWebShell.cpp b/docshell/base/nsWebShell.cpp
index 6308aced31b..853c7e572d9 100644
--- a/docshell/base/nsWebShell.cpp
+++ b/docshell/base/nsWebShell.cpp
@@ -4071,6 +4071,13 @@ NS_IMETHODIMP nsWebShell::SetFocus()
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsWebShell::FocusAvailable(nsIBaseWindow* aCurrentFocus, PRBool* aTookFocus)
+{
+   NS_ENSURE_ARG_POINTER(aTookFocus);
+   return NS_OK;
+}
+
 NS_IMETHODIMP nsWebShell::GetTitle(PRUnichar** aTitle)
 {
   *aTitle = mTitle.ToNewUnicode();
diff --git a/webshell/src/nsWebShell.cpp b/webshell/src/nsWebShell.cpp
index 6308aced31b..853c7e572d9 100644
--- a/webshell/src/nsWebShell.cpp
+++ b/webshell/src/nsWebShell.cpp
@@ -4071,6 +4071,13 @@ NS_IMETHODIMP nsWebShell::SetFocus()
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsWebShell::FocusAvailable(nsIBaseWindow* aCurrentFocus, PRBool* aTookFocus)
+{
+   NS_ENSURE_ARG_POINTER(aTookFocus);
+   return NS_OK;
+}
+
 NS_IMETHODIMP nsWebShell::GetTitle(PRUnichar** aTitle)
 {
   *aTitle = mTitle.ToNewUnicode();