diff --git a/src/exec/command.rs b/src/exec/command.rs
index 28b899851..3dc6403df 100644
--- a/src/exec/command.rs
+++ b/src/exec/command.rs
@@ -45,7 +45,7 @@ pub fn execute_command(mut cmd: Command, out_perm: Arc<Mutex<()>>) {
 /// Executes a command.
 #[cfg(all(unix))]
 pub fn execute_command(mut cmd: Command, out_perm: Arc<Mutex<()>>) {
-    use libc::{close, dup2, pipe, STDERR_FILENO, STDOUT_FILENO};
+    use libc::{close, dup2, pipe, STDOUT_FILENO};
     use std::fs::File;
     use std::os::unix::process::CommandExt;
     use std::os::unix::io::FromRawFd;
@@ -64,7 +64,6 @@ pub fn execute_command(mut cmd: Command, out_perm: Arc<Mutex<()>>) {
     let child = cmd.before_exec(move || unsafe {
         // Redirect the child's std{out,err} to the write ends of our pipe.
         dup2(stdout_fds[1], STDOUT_FILENO);
-        dup2(stderr_fds[1], STDERR_FILENO);
 
         // Close all the fds we created here, so EOF will be sent when the program exits.
         close(stdout_fds[0]);
diff --git a/tests/testenv/mod.rs b/tests/testenv/mod.rs
index ceed8fee4..60788e8c6 100644
--- a/tests/testenv/mod.rs
+++ b/tests/testenv/mod.rs
@@ -161,7 +161,12 @@ impl TestEnv {
 
     /// Assert that calling *fd* with the specified arguments produces the expected output.
     pub fn assert_output(&self, args: &[&str], expected: &str) {
-        self.assert_output_subdirectory(".", args, expected)
+        self.assert_output_subdirectory(".", args, expected, "")
+    }
+
+    /// Assert that calling *fd* with the specified arguments produces the expected stderr.
+    pub fn assert_output_error(&self, args: &[&str], expected: &str) {
+        self.assert_output_subdirectory(".", args, "", expected)
     }
 
     /// Assert that calling *fd* in the specified path under the root working directory,
@@ -170,7 +175,8 @@ impl TestEnv {
         &self,
         path: P,
         args: &[&str],
-        expected: &str,
+        expected_stdout: &str,
+        expected_stderr: &str,
     ) {
         // Setup *fd* command.
         let mut cmd = process::Command::new(&self.fd_exe);
@@ -186,12 +192,17 @@ impl TestEnv {
         }
 
         // Normalize both expected and actual output.
-        let expected = normalize_output(expected, true);
-        let actual = normalize_output(&String::from_utf8_lossy(&output.stdout), false);
+        let expected_stdout = normalize_output(expected_stdout, true);
+        let actual_stdout = normalize_output(&String::from_utf8_lossy(&output.stdout), false);
+        let expected_stderr = normalize_output(expected_stderr, true);
+        let actual_stderr = normalize_output(&String::from_utf8_lossy(&output.stderr), false);
 
         // Compare actual output to expected output.
-        if expected != actual {
-            panic!(format_output_error(args, &expected, &actual));
+        if expected_stdout != actual_stdout {
+            panic!(format_output_error(args, &expected_stdout, &actual_stdout));
+        }
+        if expected_stderr != actual_stderr {
+            panic!(format_output_error(args, &expected_stderr, &actual_stderr));
         }
     }
 }
diff --git a/tests/tests.rs b/tests/tests.rs
index 975a91b2d..497242ea5 100644
--- a/tests/tests.rs
+++ b/tests/tests.rs
@@ -93,6 +93,7 @@ fn test_explicit_root_path() {
         ../../one/two/C.Foo2
         ../../one/two/three/d.foo
         ../../one/two/three/directory_foo",
+        ""
     );
 
     te.assert_output_subdirectory(
@@ -103,6 +104,7 @@ fn test_explicit_root_path() {
         ../three
         ../three/d.foo
         ../three/directory_foo",
+        ""
     );
 }
 
@@ -505,6 +507,7 @@ fn test_symlink() {
             {dir}/symlink",
             dir = &parent_parent
         ),
+        ""
     );
 
     te.assert_output_subdirectory(
@@ -519,6 +522,7 @@ fn test_symlink() {
             dir = if cfg!(windows) { "symlink" } else { "one/two" },
             abs_path = &abs_path
         ),
+        ""
     );
 
     te.assert_output(
@@ -550,6 +554,7 @@ fn test_symlink() {
             dir = if cfg!(windows) { "symlink" } else { "one/two" },
             abs_path = &abs_path
         ),
+        ""
     );
 
     te.assert_output(
@@ -639,6 +644,11 @@ fn test_exec() {
             ),
         );
 
+        te.assert_output_error(
+            &["a.foo", "--exec", "rm", "-i", "{}"],
+            "rm: remove regular empty file 'a.foo'? ",
+        );
+
         te.assert_output(
             &["foo", "--exec", "echo", "{}"],
             "a.foo