diff --git a/test/ratio_arithmetic/ratio_add_pass.cpp b/test/ratio_arithmetic/ratio_add_pass.cpp
index 9a9a20f..cdade4b 100644
--- a/test/ratio_arithmetic/ratio_add_pass.cpp
+++ b/test/ratio_arithmetic/ratio_add_pass.cpp
@@ -20,6 +20,12 @@
 
 void test()
 {
+  {
+  typedef boost::ratio<0> R1;
+  typedef boost::ratio<0> R2;
+  typedef boost::ratio_add<R1, R2> R;
+  BOOST_RATIO_STATIC_ASSERT(R::num == 0 && R::den == 1, NOTHING, ());
+  }
     {
     typedef boost::ratio<1, 1> R1;
     typedef boost::ratio<1, 1> R2;
diff --git a/test/ratio_arithmetic/ratio_subtract_pass.cpp b/test/ratio_arithmetic/ratio_subtract_pass.cpp
index 32ecb78..4c5334a 100644
--- a/test/ratio_arithmetic/ratio_subtract_pass.cpp
+++ b/test/ratio_arithmetic/ratio_subtract_pass.cpp
@@ -21,6 +21,12 @@
 void test()
 {
 
+  {
+  typedef boost::ratio<0> R1;
+  typedef boost::ratio<0> R2;
+  typedef boost::ratio_subtract<R1, R2> R;
+  BOOST_RATIO_STATIC_ASSERT(R::num == 0 && R::den == 1, NOTHING, ());
+  }
     {
     typedef boost::ratio<1, 1> R1;
     typedef boost::ratio<1, 1> R2;