--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -7922,18 +7922,17 @@ nsCSSFrameConstructor::ContentAppended(n
 #ifdef DEBUG
   if (gReallyNoisyContentUpdates) {
     printf("nsCSSFrameConstructor::ContentAppended: resulting frame model:\n");
     parentFrame->List(stdout, 0);
   }
 #endif
 
 #ifdef ACCESSIBILITY
-  nsAccessibilityService* accService = nsIPresShell::AccService();
-  if (accService) {
+  if (nsAccessibilityService* accService = nsIPresShell::AccService()) {
     accService->ContentRangeInserted(mPresShell, aContainer,
                                      aFirstNewContent, nullptr);
   }
 #endif
 }
 
 #ifdef MOZ_XUL