diff --git a/src/Package/Fetch.zig b/src/Package/Fetch.zig
index 6c5a930285..f6e5c2e222 100644
--- a/src/Package/Fetch.zig
+++ b/src/Package/Fetch.zig
@@ -1189,7 +1189,7 @@ fn unpackTarball(f: *Fetch, out_dir: fs.Dir, reader: anytype) RunError!UnpackRes
                 .unable_to_create_file => |i| res.unableToCreateFile(stripRoot(i.file_name, res.root_dir), i.code),
                 .unable_to_create_sym_link => |i| res.unableToCreateSymLink(stripRoot(i.file_name, res.root_dir), i.link_name, i.code),
                 .unsupported_file_type => |i| res.unsupportedFileType(stripRoot(i.file_name, res.root_dir), @intFromEnum(i.file_type)),
-                .components_outside_stripped_prefix => {}, // impossible with strip_components = 0
+                .components_outside_stripped_prefix => unreachable, // unreachable with strip_components = 0
             }
         }
     }