diff --git a/cli/src/highlight.rs b/cli/src/highlight.rs
index 0f88149a..6cd19392 100644
--- a/cli/src/highlight.rs
+++ b/cli/src/highlight.rs
@@ -195,7 +195,7 @@ pub fn ansi(
     let stdout = io::stdout();
     let mut stdout = stdout.lock();
     let mut scope_stack = Vec::new();
-    for event in highlight(source, language, property_sheet, &|s| {
+    for event in highlight(source, language, property_sheet, |s| {
         language_for_injection_string(loader, s)
     })? {
         match event {
@@ -258,8 +258,8 @@ pub fn html(
         source,
         language,
         property_sheet,
-        &|s| language_for_injection_string(loader, s),
-        &|scope| {
+        |s| language_for_injection_string(loader, s),
+        |scope| {
             if let Some(css_style) = theme.css_style(scope) {
                 css_style
             } else {
diff --git a/highlight/src/lib.rs b/highlight/src/lib.rs
index 453685f4..bbe0b424 100644
--- a/highlight/src/lib.rs
+++ b/highlight/src/lib.rs
@@ -84,7 +84,7 @@ struct Highlighter<'a, T>
 where
     T: Fn(&str) -> Option<(Language, &'a PropertySheet<Properties>)>,
 {
-    injection_callback: &'a T,
+    injection_callback: T,
     source: &'a [u8],
     source_offset: usize,
     parser: Parser,
@@ -353,7 +353,7 @@ where
         source: &'a [u8],
         language: Language,
         property_sheet: &'a PropertySheet<Properties>,
-        injection_callback: &'a F,
+        injection_callback: F,
     ) -> Result<Self, String> {
         let mut parser = Parser::new();
         parser.set_language(language)?;
@@ -742,10 +742,10 @@ pub fn highlight<'a, F>(
     source: &'a [u8],
     language: Language,
     property_sheet: &'a PropertySheet<Properties>,
-    injection_callback: &'a F,
+    injection_callback: F,
 ) -> Result<impl Iterator<Item = HighlightEvent<'a>> + 'a, String>
 where
-    F: Fn(&str) -> Option<(Language, &'a PropertySheet<Properties>)>,
+    F: Fn(&str) -> Option<(Language, &'a PropertySheet<Properties>)> + 'a,
 {
     Highlighter::new(source, language, property_sheet, injection_callback)
 }
@@ -754,8 +754,8 @@ pub fn highlight_html<'a, F1, F2>(
     source: &'a [u8],
     language: Language,
     property_sheet: &'a PropertySheet<Properties>,
-    injection_callback: &'a F1,
-    attribute_callback: &'a F2,
+    injection_callback: F1,
+    attribute_callback: F2,
 ) -> Result<Vec<String>, String>
 where
     F1: Fn(&str) -> Option<(Language, &'a PropertySheet<Properties>)>,