diff --git a/.github/workflows/dev-long-tests.yml b/.github/workflows/dev-long-tests.yml
index bf287857f..f92c777d0 100644
--- a/.github/workflows/dev-long-tests.yml
+++ b/.github/workflows/dev-long-tests.yml
@@ -56,6 +56,14 @@ jobs:
         make clean
         CFLAGS="-m32 -O2" make -j test V=1
 
+  test-largeDictionary:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # tag=v4.2.2
+    - name: largeDictionary
+      run: |
+        CFLAGS="-Werror -O3" make -j -C tests test-largeDictionary
+
   no-intrinsics-fuzztest:
     runs-on: ubuntu-latest
     steps:
diff --git a/tests/.gitignore b/tests/.gitignore
index 311a8b5eb..0f155764b 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -5,6 +5,7 @@ fullbench-lib
 fuzzer
 fuzzer32
 fuzzer-dll
+largeDictionary
 zbufftest
 zbufftest32
 zbufftest-dll