diff --git a/project/histogram.cpp b/project/histogram.cpp
index 8432327..99ff361 100644
--- a/project/histogram.cpp
+++ b/project/histogram.cpp
@@ -4,11 +4,11 @@
 using namespace std;
 
 
-void find_minmax(vector<double> numbers, double& min, double& max)
+bool find_minmax(vector<double> numbers, double& min, double& max)
 {
     if (numbers.empty())
     {
-        min = max = 0;
+        return true;
     }
     else
     {
@@ -26,7 +26,7 @@ void find_minmax(vector<double> numbers, double& min, double& max)
             }
         }
     }
-    return;
+    return false;
 }
 
 vector<size_t> make_histogram (vector<double> numbers, size_t bin_count)
diff --git a/project/histogram_internal.h b/project/histogram_internal.h
index 3b5a81b..d28f5fc 100644
--- a/project/histogram_internal.h
+++ b/project/histogram_internal.h
@@ -2,6 +2,6 @@
 #define HISTOGRAM_INTERNAL_H_INCLUDED
 #include <vector>
 
-void find_minmax(std::vector<double> numbers, double& min, double& max);
+bool find_minmax(std::vector<double> numbers, double& min, double& max);
 
 #endif // HISTOGRAM_INTERNAL_H_INCLUDED
diff --git a/unittest.cpp b/unittest.cpp
index 09b46e0..8ad6e52 100644
--- a/unittest.cpp
+++ b/unittest.cpp
@@ -32,12 +32,11 @@ TEST_CASE("vector with same elements") {
 }
 
 TEST_CASE("void vector") {
-    double min = 0;
-    double max = 0;
+    double min = 3;
+    double max = 2;
     std::vector<double> numbers {};
-    find_minmax( numbers, min, max);
-    CHECK(min == 0);
-    CHECK(max == 0);
+    bool check = find_minmax(numbers, min, max);
+    CHECK(check == true);
 }