diff --git a/include/mpif.h.in b/include/mpif.h.in
index 11bba647c7..5f63ff3021 100644
--- a/include/mpif.h.in
+++ b/include/mpif.h.in
@@ -43,7 +43,7 @@
        integer OMPI_MAJOR_VERSION, OMPI_MINOR_VERSION
        integer OMPI_RELEASE_VERSION
        integer OMPI_ALPHA_VERSION, OMPI_BETA_VERSION
-       character OMPI_SVN_VERSION
+       character OMPI_SVN_VERSION(32)
        parameter (OMPI_MAJOR_VERSION=@OMPI_MAJOR_VERSION@)
        parameter (OMPI_MINOR_VERSION=@OMPI_MINOR_VERSION@)
        parameter (OMPI_RELEASE_VERSION=@OMPI_RELEASE_VERSION@)