diff --git a/configure.in b/configure.in
index 46a83f8d..64ee347b 100644
--- a/configure.in
+++ b/configure.in
@@ -57,6 +57,8 @@ AC_ARG_ENABLE(debug,
 [  --enable-debug          turn on debug support (slows down execution)],
 [enable_debug=yes], [])
 
+LIBUNWIND___THREAD
+
 CPPFLAGS="${CPPFLAGS} -D_GNU_SOURCE"
 if test x$enable_debug == xyes; then
   CPPFLAGS="${CPPFLAGS} -DDEBUG"
@@ -72,7 +74,6 @@ fi
 arch="$target_arch"
 ARCH=`echo $target_arch | tr [a-z] [A-Z]`
 
-
 AC_SUBST(arch)
 AC_SUBST(ARCH)
 AC_OUTPUT(Makefile src/Makefile tests/Makefile doc/Makefile)