diff --git a/src/test/assert.hpp b/src/test/assert.hpp
index e85125b..a27c6ca 100644
--- a/src/test/assert.hpp
+++ b/src/test/assert.hpp
@@ -15,4 +15,4 @@
 
 #include <iostream>
 
-#define ASSERT(truth) if ((truth)); else { std::cout << "Assertion failed: " << #truth << std::endl; return 1; }
+#define ASSERT(truth) if ((truth)); else { std::cout << "On line " << __LINE__ << ": Assertion failed: " << #truth << std::endl; return 1; }