diff --git a/tests/test-grammar-parser.cpp b/tests/test-grammar-parser.cpp
index ab80c9431..7022988b4 100644
--- a/tests/test-grammar-parser.cpp
+++ b/tests/test-grammar-parser.cpp
@@ -4,6 +4,7 @@
 
 #include "llama.h"
 #include "examples/grammar-parser.cpp"
+#include <cassert>
 
 int main()
 {