diff --git a/LayoutTests/fast/inline/dynamic-line-clamp-change-on-nested-content-expected.html b/LayoutTests/fast/inline/dynamic-line-clamp-change-on-nested-content-expected.html
new file mode 100644
index 000000000000..465701e3460a
--- /dev/null
+++ b/LayoutTests/fast/inline/dynamic-line-clamp-change-on-nested-content-expected.html
@@ -0,0 +1 @@
+PASS
\ No newline at end of file
diff --git a/LayoutTests/fast/inline/dynamic-line-clamp-change-on-nested-content.html b/LayoutTests/fast/inline/dynamic-line-clamp-change-on-nested-content.html
new file mode 100644
index 000000000000..fdd3fabbf513
--- /dev/null
+++ b/LayoutTests/fast/inline/dynamic-line-clamp-change-on-nested-content.html
@@ -0,0 +1,13 @@
+<style>
+#container {
+  display: -webkit-box;
+  -webkit-box-orient: vertical;
+  overflow: hidden;
+  -webkit-line-clamp: 2;
+}
+</style>
+<div id=container><div>PASS<div>if this is not<div>visible</div></div>
+<script>
+document.body.offsetHeight;
+container.style.webkitLineClamp = "1";
+</script>
diff --git a/Source/WebCore/rendering/RenderBlockFlow.cpp b/Source/WebCore/rendering/RenderBlockFlow.cpp
index 20fb9e81b70c..04b5c4edff85 100644
--- a/Source/WebCore/rendering/RenderBlockFlow.cpp
+++ b/Source/WebCore/rendering/RenderBlockFlow.cpp
@@ -452,6 +452,9 @@ void RenderBlockFlow::layoutBlock(bool relayoutChildren, LayoutUnit pageLogicalH
     if (recomputeLogicalWidthAndColumnWidth())
         relayoutChildren = true;
 
+    if (auto* layoutState = view().frameView().layoutContext().layoutState(); layoutState && layoutState->lineClamp())
+        relayoutChildren = true;
+
     rebuildFloatingObjectSetFromIntrudingFloats();
 
     LayoutUnit previousHeight = logicalHeight();