diff --git a/svg.h b/svg.h
index eb4ddb2..e4b71e7 100644
--- a/svg.h
+++ b/svg.h
@@ -9,4 +9,4 @@ void svg_text(double left, double baseline, const std::string& text);
 void svg_rect(double x, double y, double width, double height,
     const std::string& stroke = "black",
     const std::string& fill = "black");
-void show_histogram_svg(const std::vector<size_t>& bins, double bin_size, double min_val);
+void show_histogram_svg(const std::vector<size_t>& bins);