diff --git a/README.md b/README.md
index 24907ec..c9b855a 100644
--- a/README.md
+++ b/README.md
@@ -2,3 +2,13 @@
 Work in progress implementation of std::optional with monadic extensions
 
 [![Linux Build Status](https://travis-ci.org/TartanLlama/monadic-optional.png?branch=master)](https://travis-ci.org/TartanLlama/monadic-optional)
+
+### Compiler support
+
+Tested on:
+
+- clang 3.9
+- clang 3.8
+- g++ 7.2
+- g++ 5.4
+- g++ 4.8.5
diff --git a/tests/constexpr.cpp b/tests/constexpr.cpp
index ba8c3c5..8035584 100644
--- a/tests/constexpr.cpp
+++ b/tests/constexpr.cpp
@@ -9,14 +9,12 @@
 
 TEST_CASE("Constexpr", "[constexpr]") {
   SECTION("empty construct") {
-    constexpr tl::optional<int> o1;
     constexpr tl::optional<int> o2{};
     constexpr tl::optional<int> o3 = {};
     constexpr tl::optional<int> o4 = tl::nullopt;
     constexpr tl::optional<int> o5 = {tl::nullopt};
     constexpr tl::optional<int> o6(tl::nullopt);
 
-    STATIC_REQUIRE(!o1);
     STATIC_REQUIRE(!o2);
     STATIC_REQUIRE(!o3);
     STATIC_REQUIRE(!o4);