diff --git a/ZXingObjC/client/ZXCapture.m b/ZXingObjC/client/ZXCapture.m
index a7a07b0a2..f3d3c0ed0 100644
--- a/ZXingObjC/client/ZXCapture.m
+++ b/ZXingObjC/client/ZXCapture.m
@@ -514,7 +514,7 @@ - (void)replaceInput {
   }
 
   if (self.input) {
-    if (self.sessionPreset) {
+    if (!self.sessionPreset) {
       self.sessionPreset = AVCaptureSessionPreset1280x720;
     }
     self.session.sessionPreset = self.sessionPreset;