diff --git a/libs/hwui/tests/unit/CanvasContextTests.cpp b/libs/hwui/tests/unit/CanvasContextTests.cpp
index 3cc7189e5b4b5..344cc16fdf9ca 100644
--- a/libs/hwui/tests/unit/CanvasContextTests.cpp
+++ b/libs/hwui/tests/unit/CanvasContextTests.cpp
@@ -43,6 +43,10 @@ RENDERTHREAD_TEST(CanvasContext, create) {
     canvasContext->destroy(nullptr);
 }
 
+// This must be in an anonymous namespace as this class name is used in multiple
+// cpp files for different purposes and without the namespace the linker can
+// arbitrarily choose which class to link against.
+namespace {
 class TestFunctor : public Functor {
 public:
     bool didProcess = false;
@@ -52,6 +56,7 @@ public:
         return DrawGlInfo::kStatusDone;
     }
 };
+}; // end anonymous namespace
 
 RENDERTHREAD_TEST(CanvasContext, invokeFunctor) {
     TestFunctor functor;
diff --git a/libs/hwui/tests/unit/SkiaDisplayListTests.cpp b/libs/hwui/tests/unit/SkiaDisplayListTests.cpp
index 7f622eb96d049..4d79dde54b350 100644
--- a/libs/hwui/tests/unit/SkiaDisplayListTests.cpp
+++ b/libs/hwui/tests/unit/SkiaDisplayListTests.cpp
@@ -91,6 +91,10 @@ TEST(SkiaDisplayList, reuseDisplayList) {
     ASSERT_EQ(availableList.get(), nullptr);
 }
 
+// This must be in an anonymous namespace as this class name is used in multiple
+// cpp files for different purposes and without the namespace the linker can
+// arbitrarily choose which class to link against.
+namespace {
 class TestFunctor : public Functor {
 public:
     bool didSync = false;
@@ -100,6 +104,7 @@ public:
         return DrawGlInfo::kStatusDone;
     }
 };
+}; // end anonymous namespace
 
 TEST(SkiaDisplayList, syncContexts) {
     SkRect bounds = SkRect::MakeWH(200, 200);