diff --git a/garlic/exp/saiph/granularity.nix b/garlic/exp/saiph/granularity.nix
index f0db5c5..b27827a 100644
--- a/garlic/exp/saiph/granularity.nix
+++ b/garlic/exp/saiph/granularity.nix
@@ -49,7 +49,6 @@ let
     env = ''
       export OMP_NUM_THREADS=${toString hw.cpusPerSocket}
       export NANOS6_REPORT_PREFIX="#"
-      export I_MPI_THREAD_SPLIT=1
       export ASAN_SYMBOLIZER_PATH=${bsc.clangOmpss2Unwrapped}/bin/llvm-symbolizer
     '';
   };
diff --git a/garlic/exp/saiph/numcomm.nix b/garlic/exp/saiph/numcomm.nix
index 891f78e..03bd7e2 100644
--- a/garlic/exp/saiph/numcomm.nix
+++ b/garlic/exp/saiph/numcomm.nix
@@ -47,7 +47,6 @@ let
     env = ''
       export OMP_NUM_THREADS=24
       export NANOS6_REPORT_PREFIX="#"
-      export I_MPI_THREAD_SPLIT=1
       export ASAN_SYMBOLIZER_PATH=${bsc.clangOmpss2Unwrapped}/bin/llvm-symbolizer
     '';
   };