diff --git a/configure.ac b/configure.ac
index 01077847b..3060940ed 100644
--- a/configure.ac
+++ b/configure.ac
@@ -585,6 +585,7 @@ PKG_CHECK_MODULES([LIBFTDI], [libftdi1], [
 
 PKG_CHECK_MODULES([LIBGPIOD], [libgpiod < 2.0], [
 	use_libgpiod=yes
+	AC_DEFINE([HAVE_LIBGPIOD_V1], [1], [define if libgpiod is version v1.x])
 	PKG_CHECK_EXISTS([libgpiod >= 1.5],
 		[AC_DEFINE([HAVE_LIBGPIOD1_FLAGS_BIAS], [1], [define if libgpiod v1 has line request flags bias])])
 ], [use_libgpiod=no])