diff --git a/src/function_grapher.scad b/src/function_grapher.scad
index 92d35042..e000c2e1 100644
--- a/src/function_grapher.scad
+++ b/src/function_grapher.scad
@@ -14,7 +14,7 @@ use <path_extrude.scad>;
 use <shape_circle.scad>;
 
 module function_grapher(points, thickness = 1, style = "FACES") {
-    echo("`function_grapher` is deprecated since 3.1. Use `sf_thicken` instead."),
+    echo("`function_grapher` is deprecated since 3.1. Use `sf_thicken` instead.");
 
     rows = len(points);
     columns = len(points[0]);