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-rw-r--r--src/libudev/libudev-device.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libudev/libudev-device.c b/src/libudev/libudev-device.c
index 893d72c19f..c27b01db96 100644
--- a/src/libudev/libudev-device.c
+++ b/src/libudev/libudev-device.c
@@ -178,7 +178,8 @@ _public_ const char *udev_device_get_subsystem(struct udev_device *udev_device)
if (r < 0) {
errno = -r;
return NULL;
- }
+ } else if (!subsystem)
+ errno = ENODATA;
return subsystem;
}