diff --git a/common/common.h b/common/common.h
index a1925d774..417eb546c 100644
--- a/common/common.h
+++ b/common/common.h
@@ -8,6 +8,7 @@
 #include <string>
 #include <vector>
 #include <sstream>
+#include <variant>
 // Change JSON_ASSERT from assert() to GGML_ASSERT:
 #define JSON_ASSERT GGML_ASSERT
 #include "json.hpp"