diff --git a/src/llama-vocab.cpp b/src/llama-vocab.cpp
index 1ab84c584..b4e063439 100644
--- a/src/llama-vocab.cpp
+++ b/src/llama-vocab.cpp
@@ -11,6 +11,7 @@
 #include <forward_list>
 #include <queue>
 #include <sstream>
+#include <regex>
 
 //
 // helpers