diff --git a/src/test/assert.h++ b/src/test/assert.h++
index 951405b..e85125b 100644
--- a/src/test/assert.h++
+++ b/src/test/assert.h++
@@ -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 << "Assertion failed: " << #truth << std::endl; return 1; }