diff --git a/dic/debug.h b/dic/debug.h
index 1359b94..fb2870f 100644
--- a/dic/debug.h
+++ b/dic/debug.h
@@ -39,7 +39,9 @@ using std::endl;
     { \
         if (!(cond)) \
         { \
-            cerr << "ASSERTION FAILED: " << (msg) << " (at " \
+            cerr << "ASSERTION FAILED: "; \
+            cerr << msg; \
+            cerr << " (at " \
                  << __FILE__ << "#" << __LINE__ << ")\n"; \
             abort(); \
         } \