diff --git a/layout/base/public/nsIFrame.h b/layout/base/public/nsIFrame.h
index a3a2d1c4842..d8c30e35637 100644
--- a/layout/base/public/nsIFrame.h
+++ b/layout/base/public/nsIFrame.h
@@ -82,7 +82,7 @@ enum nsReflowReason {
  */
 struct nsReflowState {
   nsReflowReason   reason;         // the reason for the reflow
-  // nsReflowCommand& reflowCommand;  // only used for incremental changes
+  nsReflowCommand* reflowCommand;  // only used for incremental changes
   nsSize           maxSize;        // the available space in which to reflow
 };
 
diff --git a/layout/generic/nsIFrame.h b/layout/generic/nsIFrame.h
index a3a2d1c4842..d8c30e35637 100644
--- a/layout/generic/nsIFrame.h
+++ b/layout/generic/nsIFrame.h
@@ -82,7 +82,7 @@ enum nsReflowReason {
  */
 struct nsReflowState {
   nsReflowReason   reason;         // the reason for the reflow
-  // nsReflowCommand& reflowCommand;  // only used for incremental changes
+  nsReflowCommand* reflowCommand;  // only used for incremental changes
   nsSize           maxSize;        // the available space in which to reflow
 };