diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 2625555e9..e8b8a5c8f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -22,6 +22,8 @@ jobs:
         clangFormatVersion: 18
     - name: Prefer 'if defined' over 'ifdef'
       run: if grep -R "ifdef" benchmarks/ examples/ include/ddc/ install_test/ tests/; then exit 1; fi
+    - name: Do not include <iostream> in the headers of the library
+      run: if grep -R "#include <iostream>" include/ddc/; then exit 1; fi
     - name: Prefer spaces over tabs
       run: if grep -PR "\t" benchmarks/ cmake/ examples/ include/ddc/ install_test/ tests/; then exit 1; fi
     - name: Find modifications of Kokkos reserved macros