diff --git a/mailmap/Cargo.toml b/mailmap/Cargo.toml
index 8d2a1a40..dd3a0d39 100644
--- a/mailmap/Cargo.toml
+++ b/mailmap/Cargo.toml
@@ -11,3 +11,4 @@ categories = ["parsing"]
 license = "MIT OR Apache-2.0"
 
 [dependencies]
+uncased = "0.9.10"
diff --git a/mailmap/src/lib.rs b/mailmap/src/lib.rs
index c3984464..92d96548 100644
--- a/mailmap/src/lib.rs
+++ b/mailmap/src/lib.rs
@@ -2,6 +2,8 @@ use std::fmt;
 use std::pin::Pin;
 use std::ptr::NonNull;
 
+use uncased::{Uncased, UncasedStr};
+
 #[cfg(test)]
 mod test;
 
@@ -36,10 +38,10 @@ impl fmt::Debug for Mailmap {
 
 #[derive(Copy, Clone)]
 struct RawMapEntry {
-    canonical_name: Option<NonNull<str>>,
-    canonical_email: Option<NonNull<str>>,
-    current_name: Option<NonNull<str>>,
-    current_email: Option<NonNull<str>>,
+    canonical_name: Option<NonNull<UncasedStr>>,
+    canonical_email: Option<NonNull<UncasedStr>>,
+    current_name: Option<NonNull<UncasedStr>>,
+    current_email: Option<NonNull<UncasedStr>>,
 }
 
 impl RawMapEntry {
@@ -55,10 +57,10 @@ impl RawMapEntry {
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
 struct MapEntry<'a> {
-    canonical_name: Option<&'a str>,
-    canonical_email: Option<&'a str>,
-    current_name: Option<&'a str>,
-    current_email: Option<&'a str>,
+    canonical_name: Option<&'a UncasedStr>,
+    canonical_email: Option<&'a UncasedStr>,
+    current_name: Option<&'a UncasedStr>,
+    current_email: Option<&'a UncasedStr>,
 }
 
 impl<'a> MapEntry<'a> {
@@ -74,8 +76,8 @@ impl<'a> MapEntry<'a> {
 
 #[derive(Clone, PartialEq, PartialOrd, Ord, Eq, Hash)]
 pub struct Author {
-    pub name: String,
-    pub email: String,
+    pub name: Uncased<'static>,
+    pub email: Uncased<'static>,
 }
 
 impl fmt::Debug for Author {
@@ -107,15 +109,31 @@ impl Mailmap {
                 if let Some(name) = entry.current_name {
                     if author.name == name && author.email == email {
                         return Author {
-                            name: entry.canonical_name.unwrap_or(&author.name).to_owned(),
-                            email: entry.canonical_email.expect("canonical email").to_owned(),
+                            name: entry
+                                .canonical_name
+                                .unwrap_or(&author.name)
+                                .to_string()
+                                .into(),
+                            email: entry
+                                .canonical_email
+                                .expect("canonical email")
+                                .to_string()
+                                .into(),
                         };
                     }
                 } else {
                     if author.email == email {
                         return Author {
-                            name: entry.canonical_name.unwrap_or(&author.name).to_owned(),
-                            email: entry.canonical_email.expect("canonical email").to_owned(),
+                            name: entry
+                                .canonical_name
+                                .unwrap_or(&author.name)
+                                .to_string()
+                                .into(),
+                            email: entry
+                                .canonical_email
+                                .expect("canonical email")
+                                .to_string()
+                                .into(),
                         };
                     }
                 }
@@ -126,7 +144,7 @@ impl Mailmap {
     }
 }
 
-fn read_email<'a>(line: &mut &'a str) -> Option<&'a str> {
+fn read_email<'a>(line: &mut &'a str) -> Option<&'a UncasedStr> {
     if !line.starts_with('<') {
         return None;
     }
@@ -136,21 +154,21 @@ fn read_email<'a>(line: &mut &'a str) -> Option<&'a str> {
         .unwrap_or_else(|| panic!("could not find email end in {:?}", line));
     let ret = &line[1..end];
     *line = &line[end + 1..];
-    Some(ret)
+    Some(ret.into())
 }
 
-fn read_name<'a>(line: &mut &'a str) -> Option<&'a str> {
+fn read_name<'a>(line: &mut &'a str) -> Option<&'a UncasedStr> {
     let end = if let Some(end) = line.find('<') {
         end
     } else {
         return None;
     };
-    let ret = &line[..end].trim();
+    let ret = line[..end].trim();
     *line = &line[end..];
     if ret.is_empty() {
         None
     } else {
-        Some(ret)
+        Some(ret.into())
     }
 }
 
diff --git a/mailmap/src/test.rs b/mailmap/src/test.rs
index a6407545..c58b9c2a 100644
--- a/mailmap/src/test.rs
+++ b/mailmap/src/test.rs
@@ -23,7 +23,7 @@ fn comment_2() {
 fn email_1() {
     assert_eq!(
         test_parser!(read_email, "<foo@example.com>", ""),
-        Some("foo@example.com")
+        Some("foo@example.com".into())
     );
 }
 
@@ -35,7 +35,7 @@ fn email_2() {
             "<foo@example.com> <foo2@example.com>",
             " <foo2@example.com>"
         ),
-        Some("foo@example.com")
+        Some("foo@example.com".into())
     );
 }
 
@@ -59,7 +59,7 @@ fn name_1() {
             "Canonical Name <foo@example.com>",
             "<foo@example.com>"
         ),
-        Some("Canonical Name"),
+        Some("Canonical Name".into()),
     );
 }
 
@@ -68,10 +68,10 @@ fn line_1() {
     assert_eq!(
         parse_line("Joe Bob <email1> <email2>", 0),
         Some(MapEntry {
-            canonical_name: Some("Joe Bob"),
-            canonical_email: Some("email1"),
+            canonical_name: Some("Joe Bob".into()),
+            canonical_email: Some("email1".into()),
             current_name: None,
-            current_email: Some("email2"),
+            current_email: Some("email2".into()),
         })
     );
 }
@@ -81,18 +81,18 @@ fn line_2() {
     assert_eq!(
         parse_line("Joe Bob <email1>", 0),
         Some(MapEntry {
-            canonical_name: Some("Joe Bob"),
-            canonical_email: Some("email1"),
+            canonical_name: Some("Joe Bob".into()),
+            canonical_email: Some("email1".into()),
             current_name: None,
-            current_email: Some("email1"),
+            current_email: Some("email1".into()),
         })
     );
 }
 
 fn a(name: &str, email: &str) -> Author {
     Author {
-        name: name.into(),
-        email: email.into(),
+        name: name.to_owned().into(),
+        email: email.to_owned().into(),
     }
 }
 
@@ -123,3 +123,12 @@ fn map_4() {
     let mm = map("<PE> <CE>");
     assert_eq!(mm.canonicalize(&a("any", "CE")), a("any", "PE"));
 }
+
+#[test]
+fn case_insensitive() {
+    let mm = map("Proper Name <proper@email.xx> CoMmIt NaMe <CoMmIt@EmAiL.xX>");
+    assert_eq!(
+        mm.canonicalize(&a("Commit Name", "commit@email.xx")),
+        a("Proper Name", "proper@email.xx")
+    );
+}