1 files changed, 2 insertions, 1 deletions
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_valarray_valarray.pass.cpp
index b860413805b8..d5ae07be3634 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_valarray_valarray.pass.cpp
@@ -18,6 +18,7 @@
 #include <valarray>
 #include <cassert>
 #include <sstream>
+#include <cstddef>
 
 bool is_about(double x, double y, int p)
 {
@@ -47,7 +48,7 @@ int main()
         std::valarray<T> v2(a2, N);
         std::valarray<T> v3 = atan2(v1, v2);
         assert(v3.size() == v1.size());
-        for (int i = 0; i < v3.size(); ++i)
+        for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
 }