diff --git a/layout/generic/nsPlaceholderFrame.cpp b/layout/generic/nsPlaceholderFrame.cpp
index ed96cfcfac93..5fdee164ea2b 100644
--- a/layout/generic/nsPlaceholderFrame.cpp
+++ b/layout/generic/nsPlaceholderFrame.cpp
@@ -20,7 +20,6 @@
 #include "nsHTMLIIDs.h"
 
 #include "nsIContent.h"
-#include "nsIFloaterContainer.h"
 #include "nsIPresContext.h"
 #include "nsIRenderingContext.h"
 #include "nsIStyleContext.h"
diff --git a/layout/html/base/src/nsPlaceholderFrame.cpp b/layout/html/base/src/nsPlaceholderFrame.cpp
index ed96cfcfac93..5fdee164ea2b 100644
--- a/layout/html/base/src/nsPlaceholderFrame.cpp
+++ b/layout/html/base/src/nsPlaceholderFrame.cpp
@@ -20,7 +20,6 @@
 #include "nsHTMLIIDs.h"
 
 #include "nsIContent.h"
-#include "nsIFloaterContainer.h"
 #include "nsIPresContext.h"
 #include "nsIRenderingContext.h"
 #include "nsIStyleContext.h"