diff --git a/src/util.h b/src/util.h
index 46c2cfb..e8c7f02 100644
--- a/src/util.h
+++ b/src/util.h
@@ -2,11 +2,14 @@
 #include <stdlib.h>
 #include <stdio.h>
 
-#define ASSERT(_cond, ...) do {                                 \
-        if (!(_cond)) {                                         \
-            fprintf(stderr, "ASSERT FAILED:\n" __VA_ARGS__);    \
-            exit(1);                                            \
-        }                                                       \
+#define ASSERT(_cond, ...) do {                             \
+        if (!(_cond)) {                                     \
+            fprintf(stderr, "%s:%d: assertion failed:\n",   \
+                    __FILE__, __LINE__);                    \
+            fprintf(stderr, __VA_ARGS__);                   \
+            fprintf(stderr, "\n");                          \
+            exit(1);                                        \
+        }                                                   \
     } while (0)
 
 #define ASSERT_NON_NULL(_ptr, _who)                         \