diff --git a/CHANGELOG.md b/CHANGELOG.md
index fb0bacb08b..3785248aa7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,8 @@ Improved performance in large files when changes are clustered together.
 
 Improved syntax highlighting for keywords.
 
+Tabs are now rendered with eight spaces.
+
 ### Command Line Interface
 
 Difftastic now validates environment variables the same way as
diff --git a/src/main.rs b/src/main.rs
index a4d824e229..e5a6a00a06 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -246,10 +246,10 @@ fn diff_file_content(
     // TODO: don't replace tab characters inside string literals.
     let mut lhs_src = String::from_utf8_lossy(lhs_bytes)
         .to_string()
-        .replace('\t', "    ");
+        .replace('\t', "        ");
     let mut rhs_src = String::from_utf8_lossy(rhs_bytes)
         .to_string()
-        .replace('\t', "    ");
+        .replace('\t', "        ");
 
     // Ignore the trailing newline, if present.
     // TODO: highlight if this has changes (#144).