diff --git a/src/AbstractState.cpp b/src/AbstractState.cpp
index 7299f86f..aceee1ca 100644
--- a/src/AbstractState.cpp
+++ b/src/AbstractState.cpp
@@ -338,7 +338,7 @@ TEST_CASE("Check AbstractState","[AbstractState]")
 {
     SECTION("bad backend")
     {
-        CHECK_THROWS(std::tr1::shared_ptr<CoolProp::AbstractState> Water(CoolProp::AbstractState::factory("DEFINITELY_A_BAD_BACKEND", "Water")));
+        CHECK_THROWS(shared_ptr<CoolProp::AbstractState> Water(CoolProp::AbstractState::factory("DEFINITELY_A_BAD_BACKEND", "Water")));
     }
 }