diff --git a/histogram.h b/histogram.h
index a86c9a3..07979b8 100644
--- a/histogram.h
+++ b/histogram.h
@@ -1,5 +1,4 @@
 #pragma once
 #include <vector>
 
-std::vector<size_t>
-make_histogram(const std::vector<double>& numbers, size_t bin_count);
+std::vector<size_t> make_histogram(const std::vector<double>& numbers, size_t bin_count);