diff --git a/conanfile.py b/conanfile.py
index bc1bfad..8bf0df0 100644
--- a/conanfile.py
+++ b/conanfile.py
@@ -7,15 +7,16 @@ class CreatureLibConan(ConanFile):
     url = "https://git.p-epsilon.com/Deukhoofd/CreatureLib"
     description = "The core implementation for turn based battling using creatures."
     settings = "compiler"
-    options = {"shared": [True, False], "windows": [True, False]}
-    default_options = {"shared": True, "windows": False}
+    options = {"shared": [True, False]}
+    default_options = {"shared": True}
     generators = "cmake"
     exports_sources = "*"
     compiler = "clang"
 
     def build(self):
         cmake = CMake(self)
-        cmake.definitions["WINDOWS"] = self.settings.get_safe("windows")
+        if self.settings.get_safe("os") == "Windows":
+            cmake.definitions["WINDOWS"] = True
         cmake.configure()
         cmake.build()