diff --git a/layout/generic/ReflowInput.cpp b/layout/generic/ReflowInput.cpp
index d76287de57..b9485c0c0c 100644
--- a/layout/generic/ReflowInput.cpp
+++ b/layout/generic/ReflowInput.cpp
@@ -2815,6 +2815,8 @@ nscoord ReflowInput::GetLineHeight() const {
                                mFrame->StyleContext(),
                                blockBSize,
                                nsLayoutUtils::FontSizeInflationFor(mFrame));
+
+  return mLineHeight;
 }
 
 void ReflowInput::SetLineHeight(nscoord aLineHeight) {