--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -4939,19 +4939,18 @@ nsCSSFrameConstructor::ConstructSVGForei
   if (NS_FAILED(rv)) {
     return rv;
   }
 
   nsRefPtr<nsStyleContext> innerPseudoStyle;
   innerPseudoStyle = mPresShell->StyleSet()->
     ResolveAnonymousBoxStyle(nsCSSAnonBoxes::mozSVGForeignContent, styleContext);
 
-  nsIFrame* blockFrame = NS_NewBlockFrame(mPresShell, innerPseudoStyle,
-                                          NS_BLOCK_FLOAT_MGR |
-                                          NS_BLOCK_MARGIN_ROOT);
+  nsIFrame* blockFrame = NS_NewBlockFormattingContext(mPresShell,
+                                                      innerPseudoStyle);
   if (NS_UNLIKELY(!blockFrame)) {
     newFrame->Destroy();
     return NS_ERROR_OUT_OF_MEMORY;
   }
 
   nsFrameItems childItems;
   // Claim to be relatively positioned so that we end up being the
   // absolute containing block.