diff --git a/histogram.cpp b/histogram.cpp
index 44583e6..07d0436 100644
--- a/histogram.cpp
+++ b/histogram.cpp
@@ -1,7 +1,7 @@
 #include "histogram.h"
 #include <vector>
 
-static void
+void
 find_minmax(const std::vector<double> numbers, double& min, double& max) {
     min = numbers[0];
     max = numbers[0];