--- a/configure.ac
+++ b/configure.ac
@@ -37,11 +37,11 @@ GIO_REQUIRED=2.29.8
 POLKIT_REQUIRED=0.97
 
 # pkg-config dependency checks
-PKG_CHECK_MODULES(CUPS_PK, gio-2.0 >= $GIO_REQUIRED polkit-gobject-1 >= $POLKIT_REQUIRED)
+PKG_CHECK_MODULES(CUPS_PK, gio-2.0 >= $GIO_REQUIRED gio-unix-2.0 >= $GIO_REQUIRED polkit-gobject-1 >= $POLKIT_REQUIRED)
 AC_SUBST(CUPS_PK_CFLAGS)
 AC_SUBST(CUPS_PK_LIBS)
 
-PKG_CHECK_MODULES(TEST, gio-2.0 >= $GIO_REQUIRED)
+PKG_CHECK_MODULES(TEST, gio-2.0 >= $GIO_REQUIRED gio-unix-2.0 >= $GIO_REQUIRED)
 AC_SUBST(TEST_CFLAGS)
 AC_SUBST(TEST_LIBS)