diff --git a/build.rs b/build.rs
index eec184afb3..51d69911d1 100644
--- a/build.rs
+++ b/build.rs
@@ -55,7 +55,7 @@ fn test_directory(out: &mut File, testsuite: &str) -> io::Result<()> {
     )?;
     writeln!(
         out,
-        "    use super::{{native_isa, Path, WastContext, Compiler}};"
+        "    use super::{{native_isa, Path, WastContext, Compiler, Features}};"
     )?;
     for dir_entry in dir_entries {
         write_testsuite_tests(out, dir_entry, testsuite)?;
@@ -81,7 +81,11 @@ fn write_testsuite_tests(out: &mut File, dir_entry: DirEntry, testsuite: &str) -
     writeln!(out, "        let compiler = Compiler::new(isa);")?;
     writeln!(
         out,
-        "        let mut wast_context = WastContext::new(Box::new(compiler));"
+        "        let features = Features {{ simd: true, ..Default::default() }};"
+    )?;
+    writeln!(
+        out,
+        "        let mut wast_context = WastContext::new(Box::new(compiler)).with_features(features);"
     )?;
     writeln!(out, "        wast_context")?;
     writeln!(out, "            .register_spectest()")?;
diff --git a/tests/wast_testsuites.rs b/tests/wast_testsuites.rs
index 02d18e6eb5..7fb0b017fc 100644
--- a/tests/wast_testsuites.rs
+++ b/tests/wast_testsuites.rs
@@ -4,7 +4,7 @@ use cranelift_codegen::isa;
 use cranelift_codegen::settings;
 use cranelift_codegen::settings::Configurable;
 use std::path::Path;
-use wasmtime_jit::Compiler;
+use wasmtime_jit::{Compiler, Features};
 use wasmtime_wast::WastContext;
 
 include!(concat!(env!("OUT_DIR"), "/wast_testsuite_tests.rs"));
@@ -14,6 +14,7 @@ fn native_isa() -> Box<dyn isa::TargetIsa> {
     let mut flag_builder = settings::builder();
     flag_builder.enable("enable_verifier").unwrap();
     flag_builder.enable("avoid_div_traps").unwrap();
+    flag_builder.enable("enable_simd").unwrap();
 
     let isa_builder = cranelift_native::builder().unwrap_or_else(|_| {
         panic!("host machine is not a supported target");