diff --git a/flang/unittests/RuntimeGTest/Transformational.cpp b/flang/unittests/RuntimeGTest/Transformational.cpp
--- a/flang/unittests/RuntimeGTest/Transformational.cpp
+++ b/flang/unittests/RuntimeGTest/Transformational.cpp
@@ -212,4 +212,20 @@
     EXPECT_EQ(*result.ZeroBasedIndexedElement<std::int32_t>(j), expect[j]);
   }
   result.Destroy();
+
+  // Test for scalar value of the "field" argument
+  auto scalarField{MakeArray<TypeCategory::Integer, 4>(
+      std::vector<int>{}, std::vector<std::int32_t>{343})};
+  RTNAME(Unpack)(result, *vector, *mask, *scalarField, __FILE__, __LINE__);
+  EXPECT_EQ(result.rank(), 2);
+  EXPECT_EQ(result.GetDimension(0).LowerBound(), 1);
+  EXPECT_EQ(result.GetDimension(0).Extent(), 2);
+  EXPECT_EQ(result.GetDimension(1).LowerBound(), 1);
+  EXPECT_EQ(result.GetDimension(1).Extent(), 3);
+  static std::int32_t scalarExpect[6]{343, 1, 2, 343, 343, 3};
+  for (int j{0}; j < 6; ++j) {
+    EXPECT_EQ(
+        *result.ZeroBasedIndexedElement<std::int32_t>(j), scalarExpect[j]);
+  }
+  result.Destroy();
 }