diff --git a/ChangeLog b/ChangeLog
index 0f0a0ae98abe9a1cc7b33e379f8f63bd7be4ac34..e28b0748fed7efb3f7bd05cf5ebfe1124656ca54 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2012-10-29  Niels Möller  <nisse@lysator.liu.se>
+
+	From Martin Storsjö:
+	* configure.ac (dummy-dep-files): Avoid non-posix \|-operator in
+	sed regexp.
+
 2012-10-29  Niels Möller  <nisse@lysator.liu.se>
 
 	* x86_64/salsa20-core-internal.asm: New file.
diff --git a/configure.ac b/configure.ac
index b5f3571b002629416b54dee6ab0eec79e123ba6e..f550f21663010c6b979e10d1377e53c159715d9c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -122,7 +122,7 @@ if test x$enable_dependency_tracking = xyes ; then
 
   AC_CONFIG_COMMANDS([dummy-dep-files],
   [(cd "$srcdir" && find . '(' -name '*.c' -o -name '*.cxx' ')' -print) \
- | sed 's/\.c\(xx\|\)$//' | (while read f; do echo > "$f.o.d"; echo > "$f.po.d"; done)
+ | sed 's/\.c\(xx\)\{0,1\}$//' | (while read f; do echo > "$f.o.d"; echo > "$f.po.d"; done)
 ])
 fi