diff --git a/index.js b/index.js
index 34b68f9..ab6f5a2 100644
--- a/index.js
+++ b/index.js
@@ -84,6 +84,9 @@ function rExposure (req, res, next) {
 		set = true
 	}
 	if (set) {
+		if (exposure <= intval._frame.expected) {
+			exposure = 0;
+		}
 		intval.setExposure(exposure)
 	} else {
 		exposure = intval._state.frame.exposure