diff --git a/misc.h b/misc.h
index 7a93ef98..f0df03c2 100644
--- a/misc.h
+++ b/misc.h
@@ -379,8 +379,10 @@ template <class T1, class T2>
 inline bool SafeConvert(T1 from, T2 &to)
 {
 	to = (T2)from;
-	if (from != to || (from > 0) != (to > 0))
-		return false;
+	if (from != to || (from > 0) != (to > 0)) {
+		CRYPTOPP_ASSERT(false); return false;
+	}
+
 	return true;
 }