diff --git a/extension/llm/runner/text_llm_runner.cpp b/extension/llm/runner/text_llm_runner.cpp
index b6f41fd7af6..2d05a99aaf9 100644
--- a/extension/llm/runner/text_llm_runner.cpp
+++ b/extension/llm/runner/text_llm_runner.cpp
@@ -43,7 +43,8 @@ TextLLMRunner::TextLLMRunner(
       io_manager_(std::move(io_manager)),
       text_token_generator_(std::move(text_token_generator)),
       stats_(std::move(stats)),
-      temperature_(temperature) {
+      temperature_(temperature),
+      pos_(0) {
   // Note: This constructor assumes that text_prefiller and text_token_generator
   // already have references to the Module and TextDecoderRunner they need
 }