diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4652fbe..ba8e8ea 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,7 +13,12 @@ if (NOT DEFINED OPTCON_LOCAL_BUILD)
     FetchContent_MakeAvailable(fmt)
 endif()
 
-add_compile_options(-Wall -Wextra -Wpedantic)
+if (MSVC)
+    # https://learn.microsoft.com/en-us/cpp/build/reference/compiler-option-warning-level?view=msvc-170
+    add_compile_options(/Wall)
+else()
+    add_compile_options(-Wall -Wextra -Wpedantic)
+endif()
 
 add_subdirectory(src)
 add_subdirectory(test)
diff --git a/src/ipc.hpp b/src/ipc.hpp
index c042a76..84126d5 100644
--- a/src/ipc.hpp
+++ b/src/ipc.hpp
@@ -9,6 +9,11 @@
 #include <windows.h>
 #endif
 
+#if defined(_MSC_VER)
+// https://www.scivision.dev/ssize_t-platform-independent
+#define ssize_t std::ptrdiff_t
+#endif
+
 namespace ipc {
 
 void
diff --git a/src/ipc_win.cpp b/src/ipc_win.cpp
index 99c5841..f99b379 100644
--- a/src/ipc_win.cpp
+++ b/src/ipc_win.cpp
@@ -5,7 +5,10 @@
 #include <fmt/core.h>
 #include <string>
 #include <thread>
+
+#if !defined(_MSC_VER)
 #include <unistd.h>
+#endif
 
 #include "ipc.hpp"
 
diff --git a/test/test_ipc.cpp b/test/test_ipc.cpp
index 6247226..234fb96 100644
--- a/test/test_ipc.cpp
+++ b/test/test_ipc.cpp
@@ -2,7 +2,10 @@
 #include <cmath>
 #include <fmt/core.h>
 #include <thread>
+
+#if !defined(_MSC_VER)
 #include <unistd.h>
+#endif
 
 #include "ipc/api.hpp"