diff --git a/assert.html b/assert.html
index 9cd0706..e1c5b4f 100644
--- a/assert.html
+++ b/assert.html
@@ -122,7 +122,7 @@
 void MyContainer::erase(iterator i)
 {
   //Some sanity checks, data must be ordered
-  #ifndef BOOST_ASSERT_IS_EMPTY
+  #ifndef BOOST_ASSERT_IS_VOID
      if(i != c.begin()){
         iterator prev = i;
         --prev;
diff --git a/test/assert_is_void_test.cpp b/test/assert_is_void_test.cpp
index 86ee329..7a2d0ba 100644
--- a/test/assert_is_void_test.cpp
+++ b/test/assert_is_void_test.cpp
@@ -27,7 +27,7 @@
 #include <boost/assert.hpp>
 
 #ifndef BOOST_ASSERT_IS_VOID
-#error "Error: BOOST_ASSERT should be void in NDEBUG"
+#error "BOOST_ASSERT should NOT be void if NDEBUG is not defined"
 #endif
 
 // BOOST_DISABLE_ASSERTS, !NDEBUG