diff --git a/src/hyperfine/benchmark.rs b/src/hyperfine/benchmark.rs
index 926b41e..759274c 100644
--- a/src/hyperfine/benchmark.rs
+++ b/src/hyperfine/benchmark.rs
@@ -225,7 +225,9 @@ pub fn run_benchmark(
             &values[num]
         };
         match cmd.get_parameter() {
-            Some((param, value)) => Command::new_parametrized(preparation_command, param, *value),
+            Some((param, value)) => {
+                Command::new_parametrized(preparation_command, param, value.clone())
+            }
             None => Command::new(preparation_command),
         }
     });
@@ -418,7 +420,9 @@ pub fn run_benchmark(
             .cleanup_command
             .as_ref()
             .map(|cleanup_command| match cmd.get_parameter() {
-                Some((param, value)) => Command::new_parametrized(cleanup_command, param, *value),
+                Some((param, value)) => {
+                    Command::new_parametrized(cleanup_command, param, value.clone())
+                }
                 None => Command::new(cleanup_command),
             });
     run_cleanup_command(&options.shell, &cleanup_cmd, options.show_output)?;
@@ -433,6 +437,6 @@ pub fn run_benchmark(
         t_min,
         t_max,
         times_real,
-        cmd.get_parameter().map(|p| p.1.to_string()),
+        cmd.get_parameter().as_ref().map(|p| p.1.to_string()),
     ))
 }
diff --git a/src/hyperfine/internal.rs b/src/hyperfine/internal.rs
index f074a1f..ad6a0ec 100644
--- a/src/hyperfine/internal.rs
+++ b/src/hyperfine/internal.rs
@@ -148,3 +148,72 @@ fn test_compute_relative_speed() {
     assert_relative_eq!(1.0, annotated_results[1].relative_speed);
     assert_relative_eq!(2.5, annotated_results[2].relative_speed);
 }
+
+pub fn tokenize<'a>(values: &'a str) -> Vec<String> {
+    if values == "" {
+        return vec![];
+    }
+
+    let mut tokens = vec![];
+    let mut buf = String::new();
+
+    let mut iter = values.chars();
+    while let Some(c) = iter.next() {
+        match c {
+            '\\' => match iter.next() {
+                Some(c2 @ ',') | Some(c2 @ '\\') => {
+                    buf.push(c2);
+                }
+                Some(c2) => {
+                    buf.push('\\');
+                    buf.push(c2);
+                }
+                None => buf.push('\\'),
+            },
+            ',' => {
+                tokens.push(buf);
+                buf = String::new();
+            }
+            _ => {
+                buf.push(c);
+            }
+        };
+    }
+
+    tokens.push(buf);
+
+    tokens
+}
+
+#[test]
+fn test_tokenize_empty() {
+    assert!(tokenize("").is_empty());
+}
+
+#[test]
+fn test_tokenize_single_value() {
+    assert_eq!(tokenize(r"foo"), vec!["foo"]);
+    assert_eq!(tokenize(r" "), vec![" "]);
+    assert_eq!(tokenize(r"hello\, world!"), vec!["hello, world!"]);
+    assert_eq!(tokenize(r"\,"), vec![","]);
+    assert_eq!(tokenize(r"\,\,\,"), vec![",,,"]);
+    assert_eq!(tokenize(r"\n"), vec![r"\n"]);
+    assert_eq!(tokenize(r"\\"), vec![r"\"]);
+    assert_eq!(tokenize(r"\\\,"), vec![r"\,"]);
+}
+
+#[test]
+fn test_tokenize_multiple_values() {
+    assert_eq!(tokenize(r"foo,bar,baz"), vec!["foo", "bar", "baz"]);
+    assert_eq!(tokenize(r"hello world,foo"), vec!["hello world", "foo"]);
+
+    assert_eq!(tokenize(r"hello\,world!,baz"), vec!["hello,world!", "baz"]);
+}
+
+#[test]
+fn test_tokenize_empty_values() {
+    assert_eq!(tokenize(r"foo,,bar"), vec!["foo", "", "bar"]);
+    assert_eq!(tokenize(r",bar"), vec!["", "bar"]);
+    assert_eq!(tokenize(r"bar,"), vec!["bar", ""]);
+    assert_eq!(tokenize(r",,"), vec!["", "", ""]);
+}
diff --git a/src/hyperfine/types.rs b/src/hyperfine/types.rs
index c34b029..f65fa07 100644
--- a/src/hyperfine/types.rs
+++ b/src/hyperfine/types.rs
@@ -39,16 +39,16 @@ impl Into<NumericType> for Decimal {
     }
 }
 
-#[derive(Debug, Clone, Copy)]
-pub enum ParameterValue<'a> {
-    Text(&'a str),
+#[derive(Debug, Clone)]
+pub enum ParameterValue {
+    Text(String),
     Numeric(NumericType),
 }
 
-impl<'a> ToString for ParameterValue<'a> {
+impl<'a> ToString for ParameterValue {
     fn to_string(&self) -> String {
         match self {
-            ParameterValue::Text(value) => value.to_string(),
+            ParameterValue::Text(ref value) => value.clone(),
             ParameterValue::Numeric(value) => value.to_string(),
         }
     }
@@ -61,7 +61,7 @@ pub struct Command<'a> {
     expression: &'a str,
 
     /// A possible parameter value.
-    parameter: Option<(&'a str, ParameterValue<'a>)>,
+    parameter: Option<(&'a str, ParameterValue)>,
 }
 
 impl<'a> Command<'a> {
@@ -75,7 +75,7 @@ impl<'a> Command<'a> {
     pub fn new_parametrized(
         expression: &'a str,
         parameter: &'a str,
-        value: ParameterValue<'a>,
+        value: ParameterValue,
     ) -> Command<'a> {
         Command {
             expression,
@@ -93,7 +93,7 @@ impl<'a> Command<'a> {
         }
     }
 
-    pub fn get_parameter(&self) -> &Option<(&'a str, ParameterValue<'a>)> {
+    pub fn get_parameter(&self) -> &Option<(&'a str, ParameterValue)> {
         &self.parameter
     }
 }
diff --git a/src/main.rs b/src/main.rs
index 40f0668..e3496ca 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -13,7 +13,7 @@ use crate::hyperfine::app::get_arg_matches;
 use crate::hyperfine::benchmark::{mean_shell_spawning_time, run_benchmark};
 use crate::hyperfine::error::OptionsError;
 use crate::hyperfine::export::{ExportManager, ExportType};
-use crate::hyperfine::internal::write_benchmark_comparison;
+use crate::hyperfine::internal::{tokenize, write_benchmark_comparison};
 use crate::hyperfine::parameter_range::get_parameterized_commands;
 use crate::hyperfine::types::{
     BenchmarkResult, CmdFailureAction, Command, HyperfineOptions, OutputStyleOption, ParameterValue,
@@ -212,7 +212,7 @@ fn build_commands<'a>(matches: &'a ArgMatches<'_>) -> Vec<Command<'a>> {
         let param_name = args.next().unwrap();
         let param_list_str = args.next().unwrap();
 
-        let param_list = param_list_str.split(',').collect::<Vec<&str>>();
+        let param_list = tokenize(param_list_str);
         let command_list = command_strings.collect::<Vec<&str>>();
 
         let mut commands = Vec::with_capacity(param_list.len() * command_list.len());
@@ -222,7 +222,7 @@ fn build_commands<'a>(matches: &'a ArgMatches<'_>) -> Vec<Command<'a>> {
                 commands.push(Command::new_parametrized(
                     cmd,
                     param_name,
-                    ParameterValue::Text(value),
+                    ParameterValue::Text(value.clone()),
                 ));
             }
         }