diff --git a/include/liquid.h b/include/liquid.h
index 290778b50..52d898d07 100644
--- a/include/liquid.h
+++ b/include/liquid.h
@@ -34,6 +34,7 @@ extern "C" {
 #include <stdlib.h>
 #include <stdio.h>
 #include <time.h>
+#include <stdarg.h>
 
 // compile-time short file path: use __FILE_NAME__ if available (Clang 9+, GCC 12+)
 #ifdef __FILE_NAME__