diff --git a/text.h b/text.h
index 930d68a..86bd41e 100644
--- a/text.h
+++ b/text.h
@@ -3,7 +3,6 @@
 
 #include <vector>
 
-std::vector<size_t>
-show_histogram_text(const std::vector<double>& bins);
+void show_histogram_text(const std::vector <std::size_t> &bins);
 
 #endif // TEXT_H_INCLUDED