diff --git a/include/ucore/utils.h b/include/ucore/utils.h
index 7253f04..5f8b0af 100644
--- a/include/ucore/utils.h
+++ b/include/ucore/utils.h
@@ -84,19 +84,26 @@ const typeof( ((const type *)0)->member ) *__mptr = (ptr);    \
 /** 
  * assert() that is not affected by NDEBUG define
  */
-#define UC_ASSERT(expr) do {\
-if (!(expr) ) {\
-    fprintf(stderr,\
-    "UC_ASSERT failed '%s' %s:%d\n", UC_STRINGIFY(expr), __FILE__, __LINE__);\
-    uc_backtrace_fd(3);\
-    abort();\
+#define UC_ASSERT(expr)\
+ do {\
+    if (!(expr) ) {\
+        fprintf(stderr,\
+        "UC_ASSERT failed '%s' %s:%d\n", UC_STRINGIFY(expr), __FILE__, __LINE__);\
+        uc_backtrace_fd(2);\
+        abort();\
+    }\
 } while (0)
 
 /** 
  * Macro for asserting code that should not be reached, 
  * terminates the program if executed
  */
-#define UC_NOT_REACED() abort()
+#define UC_NOT_REACED()\
+do {\
+    fprintf(stderr, "UC_NOT_REACED at %s:%d\n", __FILE__, __LINE__);\
+    uc_backtrace_fd(2);\
+    abort();\
+while (0)
 
 /**
  * Round up X / y