diff --git a/ntcore/src/test/native/cpp/main.cpp b/ntcore/src/test/native/cpp/main.cpp
index 4cfa8ac89d..3c0a5ec13d 100644
--- a/ntcore/src/test/native/cpp/main.cpp
+++ b/ntcore/src/test/native/cpp/main.cpp
@@ -19,6 +19,7 @@ int main(int argc, char** argv) {
                      });
   ::testing::InitGoogleMock(&argc, argv);
   int ret = RUN_ALL_TESTS();
+  wpi::nt::ResetInstance(wpi::nt::GetDefaultInstance());
   return ret;
 }
 
diff --git a/wpilibc/src/test/native/cpp/OpModeRobotTest.cpp b/wpilibc/src/test/native/cpp/OpModeRobotTest.cpp
index 3dd9bc441f..cfe0444f40 100644
--- a/wpilibc/src/test/native/cpp/OpModeRobotTest.cpp
+++ b/wpilibc/src/test/native/cpp/OpModeRobotTest.cpp
@@ -23,7 +23,10 @@ class OpModeRobotTest : public ::testing::Test {
     wpi::sim::SetProgramStarted(false);
   }
 
-  void TearDown() override { wpi::sim::ResumeTiming(); }
+  void TearDown() override {
+    wpi::sim::ResumeTiming();
+    wpi::nt::ResetInstance(wpi::nt::GetDefaultInstance());
+  }
 };
 
 class MockRobot;
diff --git a/wpilibc/src/test/native/cpp/TimedRobotTest.cpp b/wpilibc/src/test/native/cpp/TimedRobotTest.cpp
index fb372dc660..662d8a6491 100644
--- a/wpilibc/src/test/native/cpp/TimedRobotTest.cpp
+++ b/wpilibc/src/test/native/cpp/TimedRobotTest.cpp
@@ -27,7 +27,10 @@ class TimedRobotTest : public ::testing::Test {
     wpi::sim::SetProgramStarted(false);
   }
 
-  void TearDown() override { wpi::sim::ResumeTiming(); }
+  void TearDown() override {
+    wpi::sim::ResumeTiming();
+    wpi::nt::ResetInstance(wpi::nt::GetDefaultInstance());
+  }
 };
 
 class MockRobot : public TimedRobot {
diff --git a/wpilibc/src/test/native/cpp/TimesliceRobotTest.cpp b/wpilibc/src/test/native/cpp/TimesliceRobotTest.cpp
index 73c817d260..a2dad12dcd 100644
--- a/wpilibc/src/test/native/cpp/TimesliceRobotTest.cpp
+++ b/wpilibc/src/test/native/cpp/TimesliceRobotTest.cpp
@@ -24,7 +24,10 @@ class TimesliceRobotTest : public ::testing::Test {
     wpi::sim::SetProgramStarted(false);
   }
 
-  void TearDown() override { wpi::sim::ResumeTiming(); }
+  void TearDown() override {
+    wpi::sim::ResumeTiming();
+    wpi::nt::ResetInstance(wpi::nt::GetDefaultInstance());
+  }
 };
 
 class MockRobot : public TimesliceRobot {