--- a/layout/base/nsLayoutUtils.cpp
+++ b/layout/base/nsLayoutUtils.cpp
@@ -9213,17 +9213,17 @@ nsLayoutUtils::ComputePartialPrerenderAr
   return result.MoveInsideAndClamp(aOverflow);
 }
 
 
 /* static */ bool
 nsLayoutUtils::SupportsServoStyleBackend(nsIDocument* aDocument)
 {
   return StyloEnabled() &&
-         aDocument->IsHTMLOrXHTML() &&
+         (aDocument->IsHTMLOrXHTML() || aDocument->IsSVGDocument()) &&
          static_cast<nsDocument*>(aDocument)->IsContentDocument();
 }
 
 static
 bool
 LineHasNonEmptyContentWorker(nsIFrame* aFrame)
 {
   // Look for non-empty frames, but ignore inline and br frames.