diff --git a/lecture.cls b/lecture.cls
index 9388d8e..2c92ec1 100644
--- a/lecture.cls
+++ b/lecture.cls
@@ -28,7 +28,7 @@
 \RequirePackage{stackrel}
 
 \usetikzlibrary{quotes, angles}
-\pgfplotsset{compat=1.16} % or \pgfplotsset{compat=newest}
+\pgfplotsset{compat=1.15} % or \pgfplotsset{compat=newest}
 
 \geometry{
     bottom=35mm