diff --git a/Rsconscript b/Rsconscript
index 6d30ced..2b3d848 100644
--- a/Rsconscript
+++ b/Rsconscript
@@ -132,7 +132,7 @@ hulk_env = env "hulk", use: %w[ldc2 x86_64-elf-gcc] do |env|
     -sse4a
     -ssse3
   ]
-  env["DFLAGS"] += %W[-g -mtriple=x86_64-unknown-elf -mattr=#{cpu_attrs.join(",")} --betterC -release -O3 --wi --enable-cross-module-inlining -code-model=large]
+  env["DFLAGS"] += %W[-g -mtriple=x86_64-unknown-elf -mattr=#{cpu_attrs.join(",")} --betterC -release -O3 --wi --enable-cross-module-inlining -code-model=large --disable-red-zone]
   env["D_IMPORT_PATH"] += %w[src]
   env["D_IMPORT_PATH"] << env.expand("^/src")
   env["LD"] = "x86_64-elf-gcc"
@@ -171,7 +171,7 @@ hello_env = env "hello", use: %w[ldc2 x86_64-w64-mingw32-gcc] do |env|
   env.Object("^/hulk_bin.o", "^/hulk_bin.S")
   env.depends("^/hulk_bin.o", hulk_env.expand("^/hulk.bin"))
   env["sources"] << "^/hulk_bin.o"
-  env["DFLAGS"] += %w[-g -mtriple=x86_64-unknown-windows-coff --betterC -release -O3 --wi --enable-cross-module-inlining]
+  env["DFLAGS"] += %w[-g -mtriple=x86_64-unknown-windows-coff --betterC -release -O3 --wi --enable-cross-module-inlining --disable-red-zone]
   env["D_IMPORT_PATH"] += %w[src uefi-d/source]
   env["LD"] = "x86_64-w64-mingw32-gcc"
   env["LDFLAGS"] += %w[-g -nostdlib -Wl,-dll -shared -Wl,--subsystem,10 -e efi_main -Wl,-Map,${_TARGET}.map]