diff --git a/test/framework/array.h b/test/framework/array.h
index f166432d39fdef61bcaa3b7ac6b2141b92cacaed..7ad94af550ddde8c76dacbf6cb810a0390090c98 100644
--- a/test/framework/array.h
+++ b/test/framework/array.h
@@ -345,23 +345,23 @@ class Array2D : public TwoDimensional<ElementType> {
 };  // end of class Array2D<ElementType>
 
 // Compares two Array2D objects for equality.
-#define EXPECT_EQ_ARRAY2D(lhs, rhs)                                          \
-  do {                                                                       \
-    ASSERT_EQ((lhs).width(), (rhs).width())                                  \
-        << "Mismatch in width." << std::endl;                                \
-    ASSERT_EQ((lhs).height(), (rhs).height())                                \
-        << "Mismatch in height." << std::endl;                               \
-    ASSERT_EQ((lhs).channels(), (rhs).channels())                            \
-        << "Mismatch in channels." << std::endl;                             \
-    auto mismatch = (lhs).compare_to((rhs));                                 \
-    if (mismatch) {                                                          \
-      auto [row, col] = *mismatch;                                           \
-      GTEST_FAIL() << "Mismatch at (row=" << row << ", col=" << col          \
-                   << "): " << std::hex << std::showbase                     \
-                   << static_cast<uint64_t>((lhs).at(row, col)[0]) << " vs " \
-                   << static_cast<uint64_t>((rhs).at(row, col)[0]) << "."    \
-                   << std::endl;                                             \
-    }                                                                        \
+// Unary + is used to ensure values are printed as integers, not chars
+#define EXPECT_EQ_ARRAY2D(lhs, rhs)                                 \
+  do {                                                              \
+    ASSERT_EQ((lhs).width(), (rhs).width())                         \
+        << "Mismatch in width." << std::endl;                       \
+    ASSERT_EQ((lhs).height(), (rhs).height())                       \
+        << "Mismatch in height." << std::endl;                      \
+    ASSERT_EQ((lhs).channels(), (rhs).channels())                   \
+        << "Mismatch in channels." << std::endl;                    \
+    auto mismatch = (lhs).compare_to((rhs));                        \
+    if (mismatch) {                                                 \
+      auto [row, col] = *mismatch;                                  \
+      GTEST_FAIL() << "Mismatch at (row=" << row << ", col=" << col \
+                   << "): " << std::hex << std::showbase            \
+                   << +(lhs).at(row, col)[0] << " vs "              \
+                   << +(rhs).at(row, col)[0] << "." << std::endl;   \
+    }                                                               \
   } while (0 != 0)
 
 // Compares two Array2D objects for inequality.
diff --git a/test/framework/utils.cpp b/test/framework/utils.cpp
index c79ec13354821d9b845db75e4dd4760d007c7ab7..a88f42a11ed13c39acc7670c56a47cdf88a2ed1e 100644
--- a/test/framework/utils.cpp
+++ b/test/framework/utils.cpp
@@ -29,8 +29,9 @@ void dump(const TwoDimensional<ElementType> *elements) {
   for (size_t row = 0; row < elements->height(); ++row) {
     for (size_t column = 0; column < elements->width(); ++column) {
       ElementType value = elements->at(row, column)[0];
+      // Unary + is used to ensure values are printed as integers, not chars
       std::cout << std::setw(2 * sizeof(ElementType)) << std::setfill('0')
-                << std::hex << (static_cast<uint64_t>(value) & mask) << " ";
+                << std::hex << +(value & mask) << " ";
     }
 
     std::cout << std::endl;