diff --git a/crates/turborepo-ci/src/lib.rs b/crates/turborepo-ci/src/lib.rs
index 01ce4d9a7f3ce..a1cf077bef753 100644
--- a/crates/turborepo-ci/src/lib.rs
+++ b/crates/turborepo-ci/src/lib.rs
@@ -215,4 +215,38 @@ mod tests {
             }
         }
     }
+
+    #[test]
+    fn test_gitlab_ci_group_name_sanitization() {
+        use chrono::DateTime;
+
+        let gitlab_vendor = get_vendor("GitLab CI");
+        let behavior = gitlab_vendor.behavior.as_ref().unwrap();
+
+        // Test with a package name containing @ and /
+        let group_name = "@organisation/package:build".to_string();
+        let start_time = DateTime::from_timestamp(1234567890, 0).unwrap();
+        let end_time = DateTime::from_timestamp(1234567900, 0).unwrap();
+
+        let start_fn = (behavior.group_prefix)(group_name.clone());
+        let end_fn = (behavior.group_suffix)(group_name.clone());
+
+        let start_output = start_fn(start_time);
+        let end_output = end_fn(end_time);
+
+        // The section identifier should be sanitized (@ -> at, / -> -)
+        assert!(start_output.contains("section_start:1234567890:at-organisation-package:build"));
+        assert!(end_output.contains("section_end:1234567900:at-organisation-package:build"));
+
+        // The description should contain the original group name
+        assert!(start_output.contains("@organisation/package:build"));
+
+        // Test with a simple package name (should work unchanged)
+        let simple_group_name = "simple-package:build".to_string();
+        let simple_start_fn = (behavior.group_prefix)(simple_group_name.clone());
+        let simple_start_output = simple_start_fn(start_time);
+
+        assert!(simple_start_output.contains("section_start:1234567890:simple-package:build"));
+        assert!(simple_start_output.contains("simple-package:build"));
+    }
 }
diff --git a/crates/turborepo-ci/src/vendors.rs b/crates/turborepo-ci/src/vendors.rs
index a1f4d60db5b24..8c1496eb5ec9d 100644
--- a/crates/turborepo-ci/src/vendors.rs
+++ b/crates/turborepo-ci/src/vendors.rs
@@ -299,8 +299,12 @@ pub(crate) fn get_vendors() -> &'static [Vendor] {
                         |group_name| {
                             Arc::new(move |start_time| {
                                 let timestamp = start_time.timestamp();
+                                // GitLab CI section names only allow /a-zA-Z0-9._-/ characters
+                                // Replace @ with 'at' and / with '-' for section identifier
+                                let sanitized_group_name =
+                                    group_name.replace('@', "at-").replace('/', "-");
                                 format!(
-                                    "\\e[0Ksection_start:{timestamp}:{group_name}\\r\\
+                                    "\\e[0Ksection_start:{timestamp}:{sanitized_group_name}\\r\\
                                      e[0K{group_name}"
                                 )
                             })
@@ -308,7 +312,12 @@ pub(crate) fn get_vendors() -> &'static [Vendor] {
                         |group_name| {
                             Arc::new(move |end_time| {
                                 let timestamp = end_time.timestamp();
-                                format!("\\e[0Ksection_end:{timestamp}:{group_name}\\r\\e[0K")
+                                // Use the same sanitization for section end
+                                let sanitized_group_name =
+                                    group_name.replace('@', "at-").replace('/', "-");
+                                format!(
+                                    "\\e[0Ksection_end:{timestamp}:{sanitized_group_name}\\r\\e[0K"
+                                )
                             })
                         },
                     )),