diff --git a/configure.ac b/configure.ac
index 7c51886a5..6d1885ea1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,7 +7,7 @@ m4_define([nm_micro_version], [11])
 m4_define([nm_nano_version],  [0])
 m4_define([nm_version],
           [nm_major_version.nm_minor_version.nm_micro_version.nm_nano_version])
-m4_define([nm_git_sha], [m4_esyscmd([ ( [[ -d ./.git/ && "$(realpath ./.git/)" = "$(realpath "$(git rev-parse --git-dir 2>/dev/null)" 2>/dev/null)" ]] && git rev-parse --verify -q HEAD 2>/dev/null ) || true ])])
+m4_define([nm_git_sha], [m4_esyscmd([ ( [ -d ./.git/ ] && [ "$(readlink -f ./.git/)" = "$(readlink -f "$(git rev-parse --git-dir 2>/dev/null)" 2>/dev/null)" ] && git rev-parse --verify -q HEAD 2>/dev/null ) || true ])])
 
 AC_INIT([NetworkManager], [nm_version],
         [http://bugzilla.gnome.org/enter_bug.cgi?product=NetworkManager],