diff --git a/src/detection/physicaldisk/physicaldisk_nbsd.c b/src/detection/physicaldisk/physicaldisk_nbsd.c
index 4d6d0b2c8..fd7c2df0a 100644
--- a/src/detection/physicaldisk/physicaldisk_nbsd.c
+++ b/src/detection/physicaldisk/physicaldisk_nbsd.c
@@ -117,6 +117,7 @@ const char* ffDetectPhysicalDisk(FFlist* result, FFPhysicalDiskOptions* options)
             continue;
         }
 
+#ifdef SINQ_EVPD // Available since NetBSD 11.0
         struct {
             struct scsipi_inquiry_evpd_header header;
             struct scsipi_inquiry_evpd_serial body;
@@ -135,6 +136,7 @@ const char* ffDetectPhysicalDisk(FFlist* result, FFPhysicalDiskOptions* options)
             }
             ffStrbufTrimRight(&device->serial, ' ');
         }
+#endif
 
         struct scsi_mode_parameter_header_6 mode = {};
         req = (scsireq_t) {