diff --git a/shaders/sh_threshold/sh_threshold.fsh b/shaders/sh_threshold/sh_threshold.fsh
index 039c5e91c..c962abb9b 100644
--- a/shaders/sh_threshold/sh_threshold.fsh
+++ b/shaders/sh_threshold/sh_threshold.fsh
@@ -16,7 +16,7 @@ uniform int       alphaThresholdUseSurf;
 uniform sampler2D alphaThresholdSurf;
 uniform float     alphaSmooth;
 
-float _step( in float threshold, in float val ) { return val <= threshold? 0. : 1.; }
+float _step( in float threshold, in float val ) { return val < threshold? 0. : 1.; }
 
 void main() {
 	float bri = brightThreshold.x;