diff --git a/src/app/graph.rs b/src/app/graph.rs
index 5b93a80..f370cfa 100644
--- a/src/app/graph.rs
+++ b/src/app/graph.rs
@@ -55,7 +55,8 @@ impl canvas::Program<app::Message, Theme, Renderer> for Graph {
                 &canvas::Path::new(|builder| {
                     for (index, value) in self.timeline.iter().enumerate() {
                         let x = index as f32 / self.timeline.len() as f32 * bounds.width;
-                        let y = bounds.height - value / 100. * bounds.height - 1.;
+                        let y = (bounds.height - value / 100. * bounds.height)
+                            .clamp(1., bounds.height - 1.);
                         builder.line_to(Point::new(x, y))
                     }
                 }),