diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f1fc19aeac..e493ca88ea 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -79,7 +79,7 @@ jobs:
 
           - name: "Debug, shared"
             os: ubuntu-latest
-            cmake_options: "-DCHECK=3
+            cmake_options: "-DCHECK=4
                             -DCMAKE_BUILD_TYPE=Debug
                             -DBOUT_ENABLE_SIGNAL=ON
                             -DBOUT_ENABLE_TRACK=ON
diff --git a/tests/unit/include/bout/test_stencil.cxx b/tests/unit/include/bout/test_stencil.cxx
index 033a865154..2d76a9a7f1 100644
--- a/tests/unit/include/bout/test_stencil.cxx
+++ b/tests/unit/include/bout/test_stencil.cxx
@@ -12,10 +12,13 @@ class IndexOffsetStructTests : public ::testing::Test {
 public:
   IndexOffsetStructTests() {
     zero = T(0, std::is_same_v<T, IndPerp> ? 1 : 5, std::is_same_v<T, Ind2D> ? 1 : 7);
+    finite =
+        T(239, std::is_same_v<T, IndPerp> ? 1 : 5, std::is_same_v<T, Ind2D> ? 1 : 12);
   }
 
   IndexOffset<T> noOffset;
   T zero;
+  T finite;
 };
 
 template <class T>
@@ -144,15 +147,15 @@ TYPED_TEST(IndexOffsetStructTests, AddToIndex) {
 TYPED_TEST(IndexOffsetStructTests, SubtractFromIndex) {
   IndexOffset<TypeParam> offset1 = {1, 0, 0}, offset2 = {0, 2, 0}, offset3 = {0, 0, 11},
                          offset4 = {2, 3, -2};
-  EXPECT_EQ(this->zero - offset1, this->zero.xm());
+  EXPECT_EQ(this->finite - offset1, this->finite.xm());
   if constexpr (!std::is_same_v<TypeParam, IndPerp>) {
-    EXPECT_EQ(this->zero - offset2, this->zero.ym(2));
+    EXPECT_EQ(this->finite - offset2, this->finite.ym(2));
   }
   if constexpr (!std::is_same_v<TypeParam, Ind2D>) {
-    EXPECT_EQ(this->zero - offset3, this->zero.zm(11));
+    EXPECT_EQ(this->finite - offset3, this->finite.zm(11));
   }
   if constexpr (std::is_same_v<TypeParam, Ind3D>) {
-    EXPECT_EQ(this->zero - offset4, this->zero.zp(2).xm(2).ym(3));
+    EXPECT_EQ(this->finite - offset4, this->finite.zp(2).xm(2).ym(3));
   }
 }