diff --git a/crates/core/tests/errors.rs b/crates/core/tests/errors.rs
index 3da3dc09..eddea288 100644
--- a/crates/core/tests/errors.rs
+++ b/crates/core/tests/errors.rs
@@ -10,7 +10,7 @@ fn error() -> Box<RusticError> {
     )
     .attach_status(Status::Permanent)
     .attach_severity(Severity::Error)
-    .attach_error_code("E001")
+    .attach_error_code("C001")
     .attach_context("path", "/path/to/file")
     .attach_context("called", "used s3 backend")
     .attach_source(std::io::Error::new(
diff --git a/crates/core/tests/snapshots/errors__error_debug.snap b/crates/core/tests/snapshots/errors__error_debug.snap
index af164a92..90b1718e 100644
--- a/crates/core/tests/snapshots/errors__error_debug.snap
+++ b/crates/core/tests/snapshots/errors__error_debug.snap
@@ -23,7 +23,7 @@ RusticError {
     ],
     docs_url: None,
     error_code: Some(
-        "E001",
+        "C001",
     ),
     new_issue_url: None,
     existing_issue_url: None,
diff --git a/crates/core/tests/snapshots/errors__error_display.snap b/crates/core/tests/snapshots/errors__error_display.snap
index 62a7651f..9269936b 100644
--- a/crates/core/tests/snapshots/errors__error_display.snap
+++ b/crates/core/tests/snapshots/errors__error_display.snap
@@ -17,7 +17,7 @@ Severity: Error
 
 Status: Permanent
 
-For more information, see: https://rustic.cli.rs/docs/errors/E001
+For more information, see: https://rustic.cli.rs/docs/errors/C001
 
 If you think this is an undiscovered bug, please open an issue at: https://github.com/rustic-rs/rustic_core/issues/new