diff --git a/layout/generic/nsBlockFrame.cpp b/layout/generic/nsBlockFrame.cpp
index a449e0d35927..c07c57db5bc5 100644
--- a/layout/generic/nsBlockFrame.cpp
+++ b/layout/generic/nsBlockFrame.cpp
@@ -2245,6 +2245,7 @@ nsBlockFrame::ReflowDirtyLines(nsBlockReflowState& aState)
           if (aState.mReflowState.WillReflowAgainForClearance()) {
             line->MarkDirty();
             keepGoing = PR_FALSE;
+            NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus);
             break;
           }