diff --git a/src/storagetm/storagetm.c b/src/storagetm/storagetm.c
index b28924a8b4..e0ca51d16d 100644
--- a/src/storagetm/storagetm.c
+++ b/src/storagetm/storagetm.c
@@ -950,9 +950,14 @@ static int device_added(Context *c, sd_device *device) {
                 .st_mode = S_IFBLK,
         };
 
-        r = sd_device_get_devnum(device, &lookup_key.st_rdev);
+        /* MIPS OABI declares st_rdev as unsigned long instead of dev_t.
+         * Use a temp var to avoid passing an incompatible pointer.
+         * https://sourceware.org/bugzilla/show_bug.cgi?id=21278 */
+        dev_t devnum;
+        r = sd_device_get_devnum(device, &devnum);
         if (r < 0)
                 return log_device_error_errno(device, r, "Failed to get major/minor from device: %m");
+        lookup_key.st_rdev = devnum;
 
         if (hashmap_contains(c->subsystems, &lookup_key)) {
                 log_debug("Device '%s' already seen.", devname);
@@ -1006,9 +1011,14 @@ static int device_removed(Context *c, sd_device *device) {
                 .st_mode = S_IFBLK,
         };
 
-        r = sd_device_get_devnum(device, &lookup_key.st_rdev);
+        /* MIPS OABI declares st_rdev as unsigned long instead of dev_t.
+         * Use a temp var to avoid passing an incompatible pointer.
+         * https://sourceware.org/bugzilla/show_bug.cgi?id=21278 */
+        dev_t devnum;
+        r = sd_device_get_devnum(device, &devnum);
         if (r < 0)
                 return log_device_error_errno(device, r, "Failed to get major/minor from device: %m");
+        lookup_key.st_rdev = devnum;
 
         NvmeSubsystem *s = hashmap_remove(c->subsystems, &lookup_key);
         if (!s)