diff --git a/src/modules/gpu/gpu.c b/src/modules/gpu/gpu.c
index 64fb14380..723a2cebe 100644
--- a/src/modules/gpu/gpu.c
+++ b/src/modules/gpu/gpu.c
@@ -386,9 +386,12 @@ bool ffGenerateGPUJsonResult(FFGPUOptions* options, yyjson_mut_doc* doc, yyjson_
         {
             case FF_GPU_TYPE_INTEGRATED: type = "Integrated"; break;
             case FF_GPU_TYPE_DISCRETE: type = "Discrete"; break;
-            default: type = "Unknown"; break;
+            default: type = NULL; break;
         }
-        yyjson_mut_obj_add_str(doc, obj, "type", type);
+        if (type)
+            yyjson_mut_obj_add_str(doc, obj, "type", type);
+        else
+            yyjson_mut_obj_add_null(doc, obj, "type");
 
         yyjson_mut_obj_add_strbuf(doc, obj, "vendor", &gpu->vendor);