diff --git a/test/exception/swap_exception_tests.cpp b/test/exception/swap_exception_tests.cpp
index 242410d7..b2bec836 100644
--- a/test/exception/swap_exception_tests.cpp
+++ b/test/exception/swap_exception_tests.cpp
@@ -90,7 +90,7 @@ template <class T> struct swap_base : public test::exception_base
   {
     try {
       d.x.swap(d.y);
-    } catch (std::runtime_error) {
+    } catch (std::runtime_error&) {
     }
 
     DISABLE_EXCEPTIONS;
diff --git a/test/unordered/at_tests.cpp b/test/unordered/at_tests.cpp
index 4d91975c..25b0951a 100644
--- a/test/unordered/at_tests.cpp
+++ b/test/unordered/at_tests.cpp
@@ -25,13 +25,13 @@ namespace at_tests {
     try {
       x.at("one");
       BOOST_ERROR("Should have thrown.");
-    } catch (std::out_of_range) {
+    } catch (std::out_of_range&) {
     }
 
     try {
       x_const.at("one");
       BOOST_ERROR("Should have thrown.");
-    } catch (std::out_of_range) {
+    } catch (std::out_of_range&) {
     }
 
     BOOST_LIGHTWEIGHT_TEST_OSTREAM << "Add elements" << std::endl;
@@ -51,13 +51,13 @@ namespace at_tests {
     try {
       x.at("three");
       BOOST_ERROR("Should have thrown.");
-    } catch (std::out_of_range) {
+    } catch (std::out_of_range&) {
     }
 
     try {
       x_const.at("three");
       BOOST_ERROR("Should have thrown.");
-    } catch (std::out_of_range) {
+    } catch (std::out_of_range&) {
     }
 
     BOOST_LIGHTWEIGHT_TEST_OSTREAM << "Finished" << std::endl;