diff --git a/README.md b/README.md
index de850b2..74a192b 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,7 @@
 [OnCompile(.TypeDone)]
 private static void Build()
 {
+    if (!Compiler.IsBuilding) return;
     CxxBuildTool.CMake(Compiler.ProjectDir + "/SDL", Compiler.BuildDir + "/" + Compiler.ProjectName + "/SDL", "-DSDL_STATIC=ON -DSDL_SHARED=OFF -DSDL_TESTS=OFF");
     CxxBuildTool.Ninja(Compiler.ProjectDir, Compiler.BuildDir + "/" + Compiler.ProjectName + "/vk_mem_alloc", "vk_mem_alloc", "-Ipath/to/vulkan/include", "vk_mem_alloc.cpp");
 }