diff --git a/src/mpiwrap/message_passing.F b/src/mpiwrap/message_passing.F
index 6850f5cc21..23f87b0c5b 100644
--- a/src/mpiwrap/message_passing.F
+++ b/src/mpiwrap/message_passing.F
@@ -1083,7 +1083,8 @@ CONTAINS
          CALL mpi_init_thread(MPI_THREAD_MULTIPLE, provided_tsl, ierr)
          IF (ierr /= 0) CALL mp_stop(ierr, "mpi_init_thread @ mp_world_init")
          IF (provided_tsl < MPI_THREAD_MULTIPLE) THEN
-             CALL mp_stop(0, "MPI library does not support the requested level of threading (MPI_THREAD_MULTIPLE), required by DLA-Future. Build CP2K without DLA-Future.")
+            CALL mp_stop(0, "MPI library does not support the requested level of threading (MPI_THREAD_MULTIPLE), "// &
+                         "required by DLA-Future. Build CP2K without DLA-Future.")
          END IF
 #else
          CALL mpi_init_thread(MPI_THREAD_SERIALIZED, provided_tsl, ierr)