diff --git a/cpp/triangle/triangle.cpp b/cpp/triangle/triangle.cpp
index 43c3d83..6f65958 100644
--- a/cpp/triangle/triangle.cpp
+++ b/cpp/triangle/triangle.cpp
@@ -32,12 +32,9 @@ kind_t kind(double a, double b, double c)
     if (a > c) swap(a, c);
     if (b > c) swap(b, c);
 
-    if (a <= 0)
+    if (a <= 0 || a + b <= c)
         throw domain_error("invalid triangle");
 
-    if (a + b <= c)
-        throw domain_error("");
-
     if (fuzzy_equal(a, c))
         return equilateral;