diff --git a/scanlines/shaders/ossc.slang b/scanlines/shaders/ossc.slang
index 18858f3..5aad005 100644
--- a/scanlines/shaders/ossc.slang
+++ b/scanlines/shaders/ossc.slang
@@ -104,7 +104,7 @@ float scanline4(float y, float lm)
 float scanline3(float y, float lm)
 {
 	float l = 1.0/LINES;
-	float m = fract(y*lm);
+	float m = fract(y*l);
 	if (m<l) return 1.0-L1*(1.0-lm*HYBRID);
 	else if (m<2.0*l) return 1.0-L2*(1.0-lm*HYBRID);
 	else return   1.0-L3*(1.0-lm*HYBRID);
@@ -143,4 +143,4 @@ void main()
 	else if (LINES == 2.0){res *= scanline2(OGL2Pos.y,lum);}
 
    FragColor = vec4(res,1.0);
-}
\ No newline at end of file
+}