diff --git a/ompi/mpi/f90/Makefile.am b/ompi/mpi/f90/Makefile.am
index 0df9fef416..b7ffa6bba2 100644
--- a/ompi/mpi/f90/Makefile.am
+++ b/ompi/mpi/f90/Makefile.am
@@ -232,7 +232,7 @@ large_sources = \
 # The rest of the files that are in the library depend on which size
 # we're building.
 
-nodist_libmpi_f90_a_SOURCES =
+nodist_libmpi_f90_a_SOURCES = mpi_sizeof.f90
 if OMPI_WANT_BUILD_F90_MEDIUM
 nodist_libmpi_f90_a_SOURCES += $(medium_sources)
 endif