diff --git a/.gitignore b/.gitignore
index 4e67faa..bac4e3a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ ocamlgsl-0.6.0.tar.gz
 /gsl-ocaml-1.17.2.tar.gz
 /gsl-ocaml-1.18.1.tar.gz
 /gsl-ocaml-1.18.2.tar.gz
+/gsl-ocaml-1.18.4.tar.gz
diff --git a/ocaml-gsl.spec b/ocaml-gsl.spec
index 76a6c8a..0188bca 100644
--- a/ocaml-gsl.spec
+++ b/ocaml-gsl.spec
@@ -1,12 +1,19 @@
 %global opt %(test -x %{_bindir}/ocamlopt && echo 1 || echo 0)
 
 Name:           ocaml-gsl
-Version:        1.18.2
-Release:        7%{?dist}
+Version:        1.18.4
+Release:        1%{?dist}
 Summary:        Interface to GSL (GNU scientific library) for OCaml
 License:        GPLv2
 
-URL:            https://mmottl.github.io/gsl-ocaml/
+# "Architectures with double-word alignment for doubles are not supported"
+# Specifically you should look at this file:
+# %{_libdir}/ocaml/caml/config.h
+# and if it has '#define ARCH_ALIGN_DOUBLE' then it is not supported,
+# but if it has '#undef ARCH_ALIGN_DOUBLE' then it is OK.
+ExcludeArch:    armv7hl
+
+URL:            https://github.com/mmottl/gsl-ocaml
 Source0:        https://github.com/mmottl/gsl-ocaml/releases/download/v%{version}/gsl-ocaml-%{version}.tar.gz
 
 
@@ -75,6 +82,10 @@ make install
 
 
 %changelog
+* Wed Jul 29 2015 Richard W.M. Jones <rjones@redhat.com> - 1.18.4-1
+- New upstream version 1.18.4.
+- Exclude armv7hl because it uses double-word alignment for doubles.
+
 * Tue Jul 28 2015 Richard W.M. Jones <rjones@redhat.com> - 1.18.2-7
 - OCaml 4.02.3 rebuild.
 
diff --git a/sources b/sources
index fb1db75..acebe6b 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-83239c537c3b2af5f02a8d646ce358d3  gsl-ocaml-1.18.2.tar.gz
+bd980dc73842910ff533c0a7675ca8f7  gsl-ocaml-1.18.4.tar.gz