diff --git a/test/main.h b/test/main.h
index d9cc95614..c4ef52838 100644
--- a/test/main.h
+++ b/test/main.h
@@ -40,6 +40,10 @@
 #define min(A,B) please_protect_your_min_with_parentheses
 #define max(A,B) please_protect_your_max_with_parentheses
 
+#define FORBIDDEN_IDENTIFIER (this_identifier_is_forbidden_to_avoid_clashes) this_identifier_is_forbidden_to_avoid_clashes
+// B0 is defined in POSIX header termios.h
+#define B0 FORBIDDEN_IDENTIFIER
+
 // the following file is automatically generated by cmake
 #include "split_test_helper.h"
 
diff --git a/test/product_selfadjoint.cpp b/test/product_selfadjoint.cpp
index 91ac7a9c1..6c1d83bf2 100644
--- a/test/product_selfadjoint.cpp
+++ b/test/product_selfadjoint.cpp
@@ -92,4 +92,5 @@ void test_product_selfadjoint()
     s = internal::random<int>(1,EIGEN_TEST_MAX_SIZE);
     CALL_SUBTEST_7( product_selfadjoint(Matrix<float,Dynamic,Dynamic,RowMajor>(s,s)) );
   }
+  EIGEN_UNUSED_VARIABLE(s)
 }