diff --git a/src/bin/runcpu.ts b/src/bin/runcpu.ts
index a3387a3..f1f940a 100644
--- a/src/bin/runcpu.ts
+++ b/src/bin/runcpu.ts
@@ -103,7 +103,7 @@ const baseFlags = [
     "-O3",
     "-flto",
     "-fuse-ld=lld",
-    "-Wl,-plugin-opt,--mattr=simd"
+    ...argv.simd ? ["-Wl,-plugin-opt,--mattr=simd"] : [],
 ];
 
 const unalignedFlags = [