diff --git a/engine/src/flutter/third_party/txt/src/txt/paragraph_txt.h b/engine/src/flutter/third_party/txt/src/txt/paragraph_txt.h
index e0cf8a6ddd6..b536b40ef9a 100644
--- a/engine/src/flutter/third_party/txt/src/txt/paragraph_txt.h
+++ b/engine/src/flutter/third_party/txt/src/txt/paragraph_txt.h
@@ -187,7 +187,7 @@ class ParagraphTxt : public Paragraph {
   mutable std::unique_ptr<icu::BreakIterator> word_breaker_;
 
   std::vector<LineMetrics> line_metrics_;
-  size_t final_line_count_;
+  size_t final_line_count_ = 0;
   std::vector<double> line_widths_;
 
   // Stores the result of Layout().