diff --git a/Tests/GeoLib/TestLineSegmentIntersect2d.cpp b/Tests/GeoLib/TestLineSegmentIntersect2d.cpp
index 819ffc4fa097f8dba52bd9250d998f33a8e76bb7..62d7a5d3c0cc8505ee86f0e9687a9ac9352fd0b7 100644
--- a/Tests/GeoLib/TestLineSegmentIntersect2d.cpp
+++ b/Tests/GeoLib/TestLineSegmentIntersect2d.cpp
@@ -50,7 +50,7 @@ public:
     ac::gtest_reporter gtest_reporter;
 };
 
-#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
+#if !defined(_MSC_VER) || (_MSC_VER >= 2000)
 // Compilers of MVS below 2015 do not support unrestricted unions. The
 // unrestricted union is used by autocheck to handle test data. The autocheck
 // workaround for MVS compilers (below version 2015) contains a bug and in the
diff --git a/Tests/GeoLib/TestSortSegments.cpp b/Tests/GeoLib/TestSortSegments.cpp
index 247dab95dfc7a731e6715faa9f9e37bf19162aa8..1b2c6c76ef8ea55d1510338e865c7589f64d28f1 100644
--- a/Tests/GeoLib/TestSortSegments.cpp
+++ b/Tests/GeoLib/TestSortSegments.cpp
@@ -8,7 +8,7 @@
  */
 
 #include <gtest/gtest.h>
-
+#include <numeric>
 #include "Tests/GeoLib/AutoCheckGenerators.h"
 
 #include "GeoLib/AnalyticalGeometry.h"
@@ -30,7 +30,7 @@ public:
     ac::gtest_reporter gtest_reporter;
 };
 
-#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
+#if !defined(_MSC_VER) || (_MSC_VER >= 2000)
 // Compilers of MVS below 2015 do not support unrestricted unions. The
 // unrestricted union is used by autocheck to handle test data. The autocheck
 // workaround for MVS compilers (below version 2015) contains a bug and in the