diff --git a/common/autoconf/configure b/common/autoconf/configure
index 00a07fccae1e9a8fed76c7717228ad4287854097..911351cb2915b34d479a944263952c13da805874 100644
--- a/common/autoconf/configure
+++ b/common/autoconf/configure
@@ -28,6 +28,9 @@ if test "x$BASH_VERSION" = x; then
   exit 1
 fi
 
+# Force autoconf to use bash.
+export CONFIG_SHELL=$BASH
+
 CONFIGURE_COMMAND_LINE="$@"
 conf_script_dir=`dirname $0`