diff --git a/src/detection/bios/bios_nbsd.c b/src/detection/bios/bios_nbsd.c
index 73b56ceed..3ab43ed0b 100644
--- a/src/detection/bios/bios_nbsd.c
+++ b/src/detection/bios/bios_nbsd.c
@@ -1,6 +1,7 @@
 #include "bios.h"
 #include "common/sysctl.h"
 #include "common/smbios.h"
+#include "common/io.h"
 
 const char* ffDetectBios(FFBiosResult* bios) {
     if (ffSysctlGetString("machdep.dmi.bios-date", &bios->date) == NULL) {
@@ -12,6 +13,8 @@ const char* ffDetectBios(FFBiosResult* bios) {
     if (ffSysctlGetString("machdep.dmi.bios-vendor", &bios->vendor) == NULL) {
         ffCleanUpSmbiosValue(&bios->vendor);
     }
-    ffSysctlGetString("machdep.bootmethod", &bios->type);
+    if (ffSysctlGetString("machdep.bootmethod", &bios->type) != NULL) {
+        ffStrbufSetStatic(&bios->type, ffPathExists("/dev/efi", FF_PATHTYPE_FILE) ? "UEFI" : "BIOS");
+    }
     return NULL;
 }