diff --git a/modules/battery/battery.c b/modules/battery/battery.c
index f6b9675..05dc7e4 100644
--- a/modules/battery/battery.c
+++ b/modules/battery/battery.c
@@ -210,8 +210,9 @@ run(struct module_run_context *ctx)
 
             if (fds[1].revents & POLLIN) {
                 struct udev_device *dev = udev_monitor_receive_device(mon);
-                bool is_us = strcmp(udev_device_get_sysname(dev), m->battery) == 0;
+                const char *sysname = udev_device_get_sysname(dev);
 
+                bool is_us = strcmp(sysname, m->battery) == 0;
                 udev_device_unref(dev);
 
                 if (!is_us)
diff --git a/particles/ramp.c b/particles/ramp.c
index c9c3c24..0e107ed 100644
--- a/particles/ramp.c
+++ b/particles/ramp.c
@@ -40,7 +40,7 @@ instantiate(const struct particle *particle, const struct tag_set *tags)
     double progress = (double)value / (max - min);
 
     size_t idx = progress * ramp->count;
-    printf("value: %lu, min: %lu, max: %lu, progress: %f, idx: %zu\n",
+    printf("ramp: value: %lu, min: %lu, max: %lu, progress: %f, idx: %zu\n",
            value, min, max, progress, idx);
     assert(idx >= 0 && idx < ramp->count);