diff --git a/configure.in b/configure.in
index d92f2a82..e6e9b05f 100644
--- a/configure.in
+++ b/configure.in
@@ -160,7 +160,7 @@ AM_CONDITIONAL(FLaC__CPU_IA32, test x$cpu_ia32 = xtrue)
 AM_CONDITIONAL(FLaC__CPU_PPC, test x$cpu_ppc = xtrue)
 AM_CONDITIONAL(FLaC__CPU_SPARC, test x$cpu_sparc = xtrue)
 case "$host" in
-	i[[3-6]]86-*-openbsd*) OBJ_FORMAT=aoutb ;;
+	i386-*-openbsd3.[[0-3]]) OBJ_FORMAT=aoutb ;;
 	*) OBJ_FORMAT=elf ;;
 esac
 AC_SUBST(OBJ_FORMAT)