diff --git a/huma.go b/huma.go
index e2189964..78b286e3 100644
--- a/huma.go
+++ b/huma.go
@@ -257,7 +257,7 @@ func findParams(registry Registry, op *Operation, t reflect.Type) *findResult[*p
 			pfi.TimeFormat = timeFormat
 		}
 
-		if !boolTag(f, "hidden", false) {
+		if !boolTag(f, "hidden", false) && pfi.Loc != "form" {
 			documentParam(op, pl)
 		}
 
diff --git a/huma_test.go b/huma_test.go
index 9e0f4a74..2f76b27f 100644
--- a/huma_test.go
+++ b/huma_test.go
@@ -1277,6 +1277,11 @@ func TestFeatures(t *testing.T) {
 				assert.Equal(t, "object", mpContent.Schema.Type)
 				assert.Equal(t, "binary", mpContent.Schema.Properties["file"].Format)
 				assert.Equal(t, "binary", mpContent.Schema.Properties["greetings"].Items.Format)
+
+				// Ensure no invalid "in": "form" parameters are present.
+				for _, param := range api.OpenAPI().Paths["/upload"].Post.Parameters {
+					assert.NotEqual(t, "form", param.In)
+				}
 			},
 			Method:  http.MethodPost,
 			URL:     "/upload",