diff --git a/src/methods/filters.rs b/src/methods/filters.rs
index 3287bf4..58df841 100644
--- a/src/methods/filters.rs
+++ b/src/methods/filters.rs
@@ -9,3 +9,7 @@ pub fn file_perms(s: &i32) -> Result<String, askama::Error> {
 pub fn hex(s: &[u8]) -> Result<String, askama::Error> {
     Ok(hex::encode(s))
 }
+
+pub fn md5(s: &str) -> Result<String, askama::Error> {
+    Ok(hex::encode(&md5::compute(s).0))
+}
diff --git a/templates/repo/log.html b/templates/repo/log.html
index 4239127..2d8167d 100644
--- a/templates/repo/log.html
+++ b/templates/repo/log.html
@@ -22,7 +22,7 @@
         </td>
         <td><a href="/{{ repo.display() }}/commit/?id={{ commit.hash|hex }}">{{ commit.summary }}</a></td>
         <td>
-            <img src="https://www.gravatar.com/avatar/{{ commit.author.email }}?s=13&d=retro" width="13" height="13">
+            <img src="https://www.gravatar.com/avatar/{{ commit.author.email|md5 }}?s=13&d=retro" width="13" height="13">
             {{ commit.author.name }}
         </td>
     </tr>