diff --git a/CesiumGltf/test/TestPropertyAttributePropertyView.cpp b/CesiumGltf/test/TestPropertyAttributePropertyView.cpp
index b2290af0a..d880a838b 100644
--- a/CesiumGltf/test/TestPropertyAttributePropertyView.cpp
+++ b/CesiumGltf/test/TestPropertyAttributePropertyView.cpp
@@ -1,3 +1,8 @@
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+
 #include "CesiumGltf/PropertyAttributePropertyView.h"
 
 #include <CesiumUtility/Assert.h>
@@ -822,3 +827,7 @@ TEST_CASE("Check that PropertyAttributeProperty values override class property "
     REQUIRE(view.get(i) == expected[static_cast<size_t>(i)]);
   }
 }
+
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
diff --git a/CesiumGltf/test/TestPropertyTablePropertyView.cpp b/CesiumGltf/test/TestPropertyTablePropertyView.cpp
index 2cd8730b3..bf6526349 100644
--- a/CesiumGltf/test/TestPropertyTablePropertyView.cpp
+++ b/CesiumGltf/test/TestPropertyTablePropertyView.cpp
@@ -1,3 +1,8 @@
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+
 #include "CesiumGltf/PropertyTablePropertyView.h"
 
 #include <catch2/catch.hpp>
@@ -57,10 +62,10 @@ template <typename T>
 static void checkNumeric(
     const std::vector<T>& values,
     const std::vector<std::optional<T>>& expected,
-    const std::optional<JsonValue> offset = std::nullopt,
-    const std::optional<JsonValue> scale = std::nullopt,
-    const std::optional<JsonValue> noData = std::nullopt,
-    const std::optional<JsonValue> defaultValue = std::nullopt) {
+    const std::optional<JsonValue>& offset = std::nullopt,
+    const std::optional<JsonValue>& scale = std::nullopt,
+    const std::optional<JsonValue>& noData = std::nullopt,
+    const std::optional<JsonValue>& defaultValue = std::nullopt) {
   std::vector<std::byte> data;
   data.resize(values.size() * sizeof(T));
   std::memcpy(data.data(), values.data(), data.size());
@@ -102,10 +107,10 @@ template <typename T, typename D = typename TypeToNormalizedType<T>::type>
 static void checkNormalizedNumeric(
     const std::vector<T>& values,
     const std::vector<std::optional<D>>& expected,
-    const std::optional<JsonValue> offset = std::nullopt,
-    const std::optional<JsonValue> scale = std::nullopt,
-    const std::optional<JsonValue> noData = std::nullopt,
-    const std::optional<JsonValue> defaultValue = std::nullopt) {
+    const std::optional<JsonValue>& offset = std::nullopt,
+    const std::optional<JsonValue>& scale = std::nullopt,
+    const std::optional<JsonValue>& noData = std::nullopt,
+    const std::optional<JsonValue>& defaultValue = std::nullopt) {
   std::vector<std::byte> data;
   data.resize(values.size() * sizeof(T));
   std::memcpy(data.data(), values.data(), data.size());
@@ -210,8 +215,8 @@ static void checkVariableLengthArray(
     PropertyComponentType offsetType,
     int64_t instanceCount,
     const std::vector<std::optional<std::vector<DataType>>>& expected,
-    const std::optional<JsonValue::Array> noData = std::nullopt,
-    const std::optional<JsonValue::Array> defaultValue = std::nullopt) {
+    const std::optional<JsonValue::Array>& noData = std::nullopt,
+    const std::optional<JsonValue::Array>& defaultValue = std::nullopt) {
   // copy data to buffer
   std::vector<std::byte> buffer;
   buffer.resize(data.size() * sizeof(DataType));
@@ -291,8 +296,8 @@ static void checkNormalizedVariableLengthArray(
     PropertyComponentType offsetType,
     int64_t instanceCount,
     const std::vector<std::optional<std::vector<NormalizedType>>>& expected,
-    const std::optional<JsonValue::Array> noData = std::nullopt,
-    const std::optional<JsonValue::Array> defaultValue = std::nullopt) {
+    const std::optional<JsonValue::Array>& noData = std::nullopt,
+    const std::optional<JsonValue::Array>& defaultValue = std::nullopt) {
   // copy data to buffer
   std::vector<std::byte> buffer;
   buffer.resize(data.size() * sizeof(DataType));
@@ -420,10 +425,10 @@ static void checkFixedLengthArray(
     const std::vector<T>& data,
     int64_t fixedLengthArrayCount,
     const std::vector<std::optional<std::vector<T>>>& expected,
-    const std::optional<JsonValue::Array> offset = std::nullopt,
-    const std::optional<JsonValue::Array> scale = std::nullopt,
-    const std::optional<JsonValue::Array> noData = std::nullopt,
-    const std::optional<JsonValue::Array> defaultValue = std::nullopt) {
+    const std::optional<JsonValue::Array>& offset = std::nullopt,
+    const std::optional<JsonValue::Array>& scale = std::nullopt,
+    const std::optional<JsonValue::Array>& noData = std::nullopt,
+    const std::optional<JsonValue::Array>& defaultValue = std::nullopt) {
   int64_t instanceCount =
       static_cast<int64_t>(data.size()) / fixedLengthArrayCount;
 
@@ -495,10 +500,10 @@ static void checkNormalizedFixedLengthArray(
     const std::vector<T>& data,
     int64_t fixedLengthArrayCount,
     const std::vector<std::optional<std::vector<D>>>& expected,
-    const std::optional<JsonValue::Array> offset = std::nullopt,
-    const std::optional<JsonValue::Array> scale = std::nullopt,
-    const std::optional<JsonValue::Array> noData = std::nullopt,
-    const std::optional<JsonValue::Array> defaultValue = std::nullopt) {
+    const std::optional<JsonValue::Array>& offset = std::nullopt,
+    const std::optional<JsonValue::Array>& scale = std::nullopt,
+    const std::optional<JsonValue::Array>& noData = std::nullopt,
+    const std::optional<JsonValue::Array>& defaultValue = std::nullopt) {
   int64_t instanceCount =
       static_cast<int64_t>(data.size()) / fixedLengthArrayCount;
 
@@ -3710,3 +3715,7 @@ TEST_CASE("Check variable-length boolean array PropertyTablePropertyView") {
     }
   }
 }
+
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
diff --git a/CesiumGltf/test/TestPropertyTexturePropertyView.cpp b/CesiumGltf/test/TestPropertyTexturePropertyView.cpp
index 8ad8e1b86..31a374ea2 100644
--- a/CesiumGltf/test/TestPropertyTexturePropertyView.cpp
+++ b/CesiumGltf/test/TestPropertyTexturePropertyView.cpp
@@ -1,3 +1,8 @@
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+
 #include "CesiumGltf/KhrTextureTransform.h"
 #include "CesiumGltf/PropertyTexturePropertyView.h"
 #include "CesiumUtility/Math.h"
@@ -2050,3 +2055,7 @@ TEST_CASE("Test normalized PropertyTextureProperty constructs with "
     REQUIRE(view.get(uv[0], uv[1]) == static_cast<double>(data[i]) / 255.0);
   }
 }
+
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif