diff --git a/lectures/courseoutline.cls b/lectures/courseoutline.cls
index ab3d8ec..c188b06 100644
--- a/lectures/courseoutline.cls
+++ b/lectures/courseoutline.cls
@@ -23,7 +23,7 @@
 \RequirePackage{geometry}
 \RequirePackage{pifont}
 \RequirePackage{parskip}        % Space-separated rather than indented paragraphs.
-\RequirePackage(etoolbox)       % Mainly for \AfterEndPreamble.
+\RequirePackage{etoolbox}       % Mainly for \AfterEndPreamble.
 % DO NOT REMOVE THE NEXT LINE! The lecturecommon package loads a bunch
 % of other packages and sets up various counters, etc., several of which
 % are used below.