diff --git a/CMakeLists.txt b/CMakeLists.txt
index b041380..304b43e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,6 +11,15 @@ add_library(${PROJECT_NAME} INTERFACE)
 target_include_directories(${PROJECT_NAME} INTERFACE headers)
 target_compile_features(${PROJECT_NAME} INTERFACE cxx_std_17)
 
+target_compile_options(${PROJECT_NAME}
+    INTERFACE
+    $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:
+        -Wno-c++98-compat-pedantic
+        -Wno-ctad-maybe-unsupported
+        -Wno-padded
+        -Wno-poison-system-directories
+        -Wno-unknown-warning-option>)
+
 if(BUILD_AS_STANDALONE)
     option(BUILD_WITH_UNTESTS "Build with unit tests" ON)
     if(BUILD_WITH_UNTESTS)
diff --git a/untests/CMakeLists.txt b/untests/CMakeLists.txt
index 7b18715..c9beb8e 100644
--- a/untests/CMakeLists.txt
+++ b/untests/CMakeLists.txt
@@ -23,9 +23,12 @@ target_link_libraries(${PROJECT_NAME} kari.hpp)
 target_compile_options(${PROJECT_NAME}
     PRIVATE
     $<$<CXX_COMPILER_ID:MSVC>:
-        /W4>
+        /WX /W4>
     PRIVATE
-    $<$<OR:$<CXX_COMPILER_ID:GNU>,$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:
-        -Wall -Wextra -Wpedantic>)
+    $<$<CXX_COMPILER_ID:GNU>:
+        -Werror -Wall -Wextra -Wpedantic>
+    PRIVATE
+    $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:
+        -Werror -Weverything -Wconversion>)
 
 add_test(${PROJECT_NAME} ${PROJECT_NAME})
diff --git a/untests/doctest/doctest.hpp b/untests/doctest/doctest.hpp
index c1fc7ee..cf95de5 100644
--- a/untests/doctest/doctest.hpp
+++ b/untests/doctest/doctest.hpp
@@ -4,8 +4,8 @@
 
 #define STATIC_REQUIRE(...)\
     static_assert(__VA_ARGS__, #__VA_ARGS__);\
-    REQUIRE(__VA_ARGS__);
+    REQUIRE(__VA_ARGS__)
 
 #define STATIC_REQUIRE_FALSE(...)\
     static_assert(!(__VA_ARGS__), "!(" #__VA_ARGS__ ")");\
-    REQUIRE(!(__VA_ARGS__));
+    REQUIRE(!(__VA_ARGS__))
diff --git a/untests/kari_ext_tests.cpp b/untests/kari_ext_tests.cpp
index deb2027..c1526ef 100644
--- a/untests/kari_ext_tests.cpp
+++ b/untests/kari_ext_tests.cpp
@@ -13,7 +13,7 @@ using namespace kari_hpp::ext;
 TEST_CASE("kari_ext") {
     struct box final {
         int v;
-        constexpr box(int v): v(v) {}
+        constexpr box(int nv): v(nv) {}
     };
 
     SUBCASE("fid") {
diff --git a/untests/kari_tests.cpp b/untests/kari_tests.cpp
index a1d2c0c..64aca60 100644
--- a/untests/kari_tests.cpp
+++ b/untests/kari_tests.cpp
@@ -471,7 +471,7 @@ TEST_CASE("kari") {
             : v_(v) {}
 
             box(box&&) = default;
-            box& operator=(box&&) = default;
+            box& operator=(box&&) = delete;
 
             box(const box&) = delete;
             box& operator=(const box&) = delete;