diff --git a/.travis.yml b/.travis.yml
index 5a2a893196dc..5bc7f291d762 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,11 @@ before_script:
 - cargo install xargo
 - export RUST_SYSROOT=$HOME/rust
 script:
+- |
+  # get ourselves a MIR-ful libstd
+  cd xargo &&
+  RUSTFLAGS='-Zalways-encode-mir' xargo build &&
+  cd ..
 - |
   # Test plain miri
   cargo build &&
@@ -22,11 +27,7 @@ script:
   cargo miri test &&
   cd ..
 - |
-  # get ourselves a MIR-ful libstd
-  cd xargo &&
-  RUSTFLAGS='-Zalways-encode-mir' xargo build &&
-  cd .. &&
-  # and run the tests with it
+  # and run all tests with full mir
   MIRI_SYSROOT=~/.xargo/HOST cargo test
 notifications:
   email:
diff --git a/tests/compiletest.rs b/tests/compiletest.rs
index e6535ef0212b..fe9cbd647906 100644
--- a/tests/compiletest.rs
+++ b/tests/compiletest.rs
@@ -27,13 +27,17 @@ fn run_pass() {
     compiletest::run_tests(&config);
 }
 
-fn miri_pass(path: &str, target: &str, host: &str) {
+fn miri_pass(path: &str, target: &str, host: &str, fullmir: bool) {
     let mut config = compiletest::default_config();
     config.mode = "mir-opt".parse().expect("Invalid mode");
     config.src_base = PathBuf::from(path);
     config.target = target.to_owned();
     config.host = host.to_owned();
     config.rustc_path = PathBuf::from("target/debug/miri");
+    if fullmir {
+        let sysroot = Path::new(&std::env::var("HOME").unwrap()).join(".xargo").join("HOST");
+        config.target_rustcflags = Some(format!("--sysroot {}", sysroot.to_str().unwrap()));
+    }
     // don't actually execute the final binary, it might be for other targets and we only care
     // about running miri, not the binary.
     config.runtool = Some("echo \"\" || ".to_owned());
@@ -116,6 +120,7 @@ fn compile_test() {
             let sysroot = libs.join("rustlib").join(&host).join("lib");
             let paths = std::env::join_paths(&[libs, sysroot]).unwrap();
             cmd.env(compiletest::procsrv::dylib_env_var(), paths);
+            cmd.env("MIRI_SYSROOT", Path::new(&std::env::var("HOME").unwrap()).join(".xargo").join("HOST"));
 
             match cmd.output() {
                 Ok(ref output) if output.status.success() => {
@@ -197,8 +202,9 @@ fn compile_test() {
     } else {
         run_pass();
         for_all_targets(sysroot, |target| {
-            miri_pass("tests/run-pass", &target, host);
+            miri_pass("tests/run-pass", &target, host, false);
         });
+        miri_pass("tests/run-pass-fullmir", host, host, true);
         compile_fail(sysroot);
     }
 }
diff --git a/tests/run-pass/loop-break-value.rs b/tests/run-pass-fullmir/loop-break-value.rs
similarity index 100%
rename from tests/run-pass/loop-break-value.rs
rename to tests/run-pass-fullmir/loop-break-value.rs