diff --git a/var/spack/repos/builtin/packages/m4/package.py b/var/spack/repos/builtin/packages/m4/package.py
index ebfbc28612e9a7a073b2b2b86a79516418c8503e..415c55b21a5cf801d9f09f69337a3447708f96d1 100644
--- a/var/spack/repos/builtin/packages/m4/package.py
+++ b/var/spack/repos/builtin/packages/m4/package.py
@@ -31,6 +31,7 @@ class M4(AutotoolsPackage):
     homepage = "https://www.gnu.org/software/m4/m4.html"
     url      = "ftp://ftp.gnu.org/gnu/m4/m4-1.4.17.tar.gz"
 
+    version('1.4.18', 'a077779db287adf4e12a035029002d28')
     version('1.4.17', 'a5e9954b1dae036762f7b13673a2cf76')
 
     patch('pgi.patch', when='@1.4.17')