diff --git a/hwcpipe/include/hwcpipe/sampler.hpp b/hwcpipe/include/hwcpipe/sampler.hpp
index b50b660..9638041 100644
--- a/hwcpipe/include/hwcpipe/sampler.hpp
+++ b/hwcpipe/include/hwcpipe/sampler.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023-2024 Arm Limited.
+ * Copyright (c) 2023-2025 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  */
@@ -75,7 +75,7 @@ struct counter_sample {
 
     /** Default constructor */
     counter_sample()
-        : counter_sample(hwcpipe_counter(), 0, 0UL) {}
+        : counter_sample(hwcpipe_counter(), 0, static_cast<uint64_t>(0UL)) {}
 };
 
 /**
diff --git a/test/counter-sampler.cpp b/test/counter-sampler.cpp
index eecf824..d97f0c7 100644
--- a/test/counter-sampler.cpp
+++ b/test/counter-sampler.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023-2024 Arm Limited.
+ * Copyright (c) 2023-2025 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  */
@@ -44,12 +44,22 @@ struct hwcpipe_sampler_mock_policy {
 using namespace hwcpipe::mock;
 using sampler_t = hwcpipe::sampler<hwcpipe_sampler_mock_policy>;
 
+TEST_CASE("counter_sampler__DefaultConstructor") {
+    SECTION("uint64") {
+        counter_sample sample;
+
+        REQUIRE(sample.timestamp == 0);
+        REQUIRE(sample.value.uint64 == static_cast<uint64_t>(0UL));
+        REQUIRE(sample.type == counter_sample::type::uint64);
+    }
+}
+
 TEST_CASE("counter_sampler__CorrectTypesAreAssigned") {
     SECTION("uint64") {
-        counter_sample sample{hwcpipe_counter(), 0xbaadcafe, 42UL};
+        counter_sample sample{hwcpipe_counter(), 0xbaadcafe, static_cast<uint64_t>(42UL)};
 
         REQUIRE(sample.timestamp == 0xbaadcafe);
-        REQUIRE(sample.value.uint64 == 42);
+        REQUIRE(sample.value.uint64 == static_cast<uint64_t>(42));
         REQUIRE(sample.type == counter_sample::type::uint64);
     }