diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7b17b207ae..9c010e6eea 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -445,6 +445,11 @@ if(OTELCPP_MAINTAINER_MODE)
     add_compile_options(/wd4267)
 
     # Enforced warnings
+    add_compile_options(/we4265) # 'class': class has virtual functions, but
+                                 # destructor is not virtual
+    add_compile_options(/we5204) # A class with virtual functions has
+                                 # non-virtual trivial destructor.
+
   elseif()
     message(FATAL_ERROR "Building with unknown compiler in maintainer mode.")
   endif()
diff --git a/api/test/nostd/span_test.cc b/api/test/nostd/span_test.cc
index 09d32ecfb8..98e825142d 100644
--- a/api/test/nostd/span_test.cc
+++ b/api/test/nostd/span_test.cc
@@ -182,10 +182,10 @@ TEST(SpanTest, Iteration)
   std::array<int, 3> array = {1, 2, 3};
 
   span<int> s1{array.data(), array.size()};
-  EXPECT_EQ(std::distance(s1.begin(), s1.end()), array.size());
+  EXPECT_EQ(std::distance(s1.begin(), s1.end()), (ptrdiff_t)array.size());
   EXPECT_TRUE(std::equal(s1.begin(), s1.end(), array.begin()));
 
   span<int, 3> s2{array.data(), array.size()};
-  EXPECT_EQ(std::distance(s2.begin(), s2.end()), array.size());
+  EXPECT_EQ(std::distance(s2.begin(), s2.end()), (ptrdiff_t)array.size());
   EXPECT_TRUE(std::equal(s2.begin(), s2.end(), array.begin()));
 }
diff --git a/examples/http/client.cc b/examples/http/client.cc
index d12a672049..ffba48940d 100644
--- a/examples/http/client.cc
+++ b/examples/http/client.cc
@@ -82,7 +82,7 @@ int main(int argc, char *argv[])
   // The port the validation service listens to can be specified via the command line.
   if (argc > 1)
   {
-    port = atoi(argv[1]);
+    port = (uint16_t)(atoi(argv[1]));
   }
   else
   {
diff --git a/examples/http/server.cc b/examples/http/server.cc
index 6b5947192b..13f250684e 100644
--- a/examples/http/server.cc
+++ b/examples/http/server.cc
@@ -75,7 +75,7 @@ int main(int argc, char *argv[])
   // The port the validation service listens to can be specified via the command line.
   if (argc > 1)
   {
-    server_port = atoi(argv[1]);
+    server_port = (uint16_t)atoi(argv[1]);
   }
 
   HttpServer http_server(server_name, server_port);
diff --git a/exporters/etw/include/opentelemetry/exporters/etw/etw_tail_sampler.h b/exporters/etw/include/opentelemetry/exporters/etw/etw_tail_sampler.h
index c4d0a2edd7..c7fa7ec0cf 100644
--- a/exporters/etw/include/opentelemetry/exporters/etw/etw_tail_sampler.h
+++ b/exporters/etw/include/opentelemetry/exporters/etw/etw_tail_sampler.h
@@ -21,6 +21,7 @@ class TailSampler
   //      Span::GetContext()
   virtual opentelemetry::sdk::trace::SamplingResult ShouldSample(
       const opentelemetry::trace::Span &span) noexcept = 0;
+  virtual ~TailSampler()                               = default;
 };
 
 class AlwaysOnTailSampler : public TailSampler
diff --git a/ext/include/opentelemetry/ext/http/client/curl/http_operation_curl.h b/ext/include/opentelemetry/ext/http/client/curl/http_operation_curl.h
index d1c6e16d96..eb3fd186df 100644
--- a/ext/include/opentelemetry/ext/http/client/curl/http_operation_curl.h
+++ b/ext/include/opentelemetry/ext/http/client/curl/http_operation_curl.h
@@ -6,7 +6,13 @@
 #include "opentelemetry/ext/http/client/http_client.h"
 #include "opentelemetry/version.h"
 
-#include <future>
+#if defined(_MSC_VER)
+#  pragma warning(suppress : 5204)
+#  include <future>
+#else
+#  include <future>
+#endif
+
 #include <map>
 #include <regex>
 #include <sstream>
diff --git a/sdk/src/metrics/export/periodic_exporting_metric_reader.cc b/sdk/src/metrics/export/periodic_exporting_metric_reader.cc
index 4220509b74..1d2f96db00 100644
--- a/sdk/src/metrics/export/periodic_exporting_metric_reader.cc
+++ b/sdk/src/metrics/export/periodic_exporting_metric_reader.cc
@@ -6,7 +6,12 @@
 #include "opentelemetry/sdk/metrics/push_metric_exporter.h"
 
 #include <chrono>
-#include <future>
+#if defined(_MSC_VER)
+#  pragma warning(suppress : 5204)
+#  include <future>
+#else
+#  include <future>
+#endif
 
 OPENTELEMETRY_BEGIN_NAMESPACE
 namespace sdk
diff --git a/sdk/test/trace/tracer_test.cc b/sdk/test/trace/tracer_test.cc
index 3287b39e5d..399c3c6d9f 100644
--- a/sdk/test/trace/tracer_test.cc
+++ b/sdk/test/trace/tracer_test.cc
@@ -271,11 +271,11 @@ TEST(Tracer, StartSpanWithAttributes)
   ASSERT_EQ(9, cur_span_data->GetAttributes().size());
   ASSERT_EQ(314159, nostd::get<int32_t>(cur_span_data->GetAttributes().at("attr1")));
   ASSERT_EQ(false, nostd::get<bool>(cur_span_data->GetAttributes().at("attr2")));
-  ASSERT_EQ(314159, nostd::get<uint32_t>(cur_span_data->GetAttributes().at("attr3")));
+  ASSERT_EQ((uint32_t)314159, nostd::get<uint32_t>(cur_span_data->GetAttributes().at("attr3")));
   ASSERT_EQ(-20, nostd::get<int32_t>(cur_span_data->GetAttributes().at("attr4")));
-  ASSERT_EQ(20, nostd::get<uint32_t>(cur_span_data->GetAttributes().at("attr5")));
+  ASSERT_EQ((uint32_t)20, nostd::get<uint32_t>(cur_span_data->GetAttributes().at("attr5")));
   ASSERT_EQ(-20, nostd::get<int64_t>(cur_span_data->GetAttributes().at("attr6")));
-  ASSERT_EQ(20, nostd::get<uint64_t>(cur_span_data->GetAttributes().at("attr7")));
+  ASSERT_EQ((uint64_t)20, nostd::get<uint64_t>(cur_span_data->GetAttributes().at("attr7")));
   ASSERT_EQ(3.1, nostd::get<double>(cur_span_data->GetAttributes().at("attr8")));
   ASSERT_EQ("string", nostd::get<std::string>(cur_span_data->GetAttributes().at("attr9")));