diff --git a/environments/hlrs/spack.yaml b/environments/hlrs/spack.yaml
index d6e3f26..5c2ca52 100644
--- a/environments/hlrs/spack.yaml
+++ b/environments/hlrs/spack.yaml
@@ -14,7 +14,7 @@ spack:
       - [$%core_compiler]
     - matrix:
       - [mpip, extrae]
-      - ['cflags="-Wno-error=implicit-function-declaration -Wno-error=implicit-int"']
+      - ['cflags="-Wno-error=implicit-function-declaration -Wno-error=implicit-int -Wno-error=int-conversion"']
       - [$^mpis]
       - [$%compilers]
   view: false