diff --git a/runtime/starpu/control/runtime_descriptor.c b/runtime/starpu/control/runtime_descriptor.c
index f1837489ce2e5ab6610c6c00f5bb82845bf5ff9e..7cb55b12a30be1237214d99fc9e2fd79994e8d87 100644
--- a/runtime/starpu/control/runtime_descriptor.c
+++ b/runtime/starpu/control/runtime_descriptor.c
@@ -31,7 +31,7 @@
  These values can be changed through the call CHAMELEON_user_tag_size(int tag_width, int tag_sep) */
 #define TAG_WIDTH_MIN 20
 static int tag_width = 31;
-static int tag_sep   = 24;
+static int tag_sep   = 20;
 static int _tag_mpi_initialized_ = 0;
 
 static inline int