diff --git a/zebra-test/src/command.rs b/zebra-test/src/command.rs
index 35988b12..5bb9b545 100644
--- a/zebra-test/src/command.rs
+++ b/zebra-test/src/command.rs
@@ -6,6 +6,9 @@ use std::process::{Child, Command, ExitStatus, Output};
 use std::{env, fs};
 use tempdir::TempDir;
 
+#[cfg(unix)]
+use std::os::unix::process::ExitStatusExt;
+
 /// Runs a command in a TempDir
 pub fn test_cmd(path: &str) -> Result<(Command, impl Drop)> {
     let dir = TempDir::new(path)?;
@@ -226,4 +229,13 @@ impl TestOutput {
         .with_section(command)
         .with_section(stdout)
     }
+
+    /// Returns true if the program was killed, false if exit was by another reason.
+    pub fn was_killed(&self) -> bool {
+        #[cfg(unix)]
+        return self.output.status.signal() == Some(9);
+
+        #[cfg(not(unix))]
+        return self.output.status.code() == Some(1);
+    }
 }
diff --git a/zebrad/tests/acceptance.rs b/zebrad/tests/acceptance.rs
index eb491a4e..ebd86855 100644
--- a/zebrad/tests/acceptance.rs
+++ b/zebrad/tests/acceptance.rs
@@ -147,6 +147,9 @@ fn seed_no_args() -> Result<()> {
 
     output.stdout_contains(r"Starting zebrad in seed mode")?;
 
+    // Make sure the command was killed
+    assert!(output.was_killed());
+
     Ok(())
 }
 
@@ -186,6 +189,9 @@ fn start_no_args() -> Result<()> {
 
     output.stdout_contains(r"Starting zebrad")?;
 
+    // Make sure the command was killed
+    assert!(output.was_killed());
+
     Ok(())
 }
 
@@ -198,6 +204,10 @@ fn start_args() -> Result<()> {
     std::thread::sleep(Duration::from_secs(1));
     child.kill()?;
     let output = child.wait_with_output()?;
+
+    // Make sure the command was killed
+    assert!(output.was_killed());
+
     output.assert_failure()?;
 
     // unrecognized option `-f`