diff --git a/Resources/Textures/Shaders/ethereal.swsl b/Resources/Textures/Shaders/ethereal.swsl
index 9c60942ebc6..dc9d971e1cd 100644
--- a/Resources/Textures/Shaders/ethereal.swsl
+++ b/Resources/Textures/Shaders/ethereal.swsl
@@ -64,7 +64,7 @@ void fragment() {
 
     highp vec4 background = zTextureSpec(SCREEN_TEXTURE, ( FRAGCOORD.xy + vec2(w) ) * SCREEN_PIXEL_SIZE );
     highp vec3 hsvBg = rgb2hsv(background.rgb);
-    hsvBg.x *= -1;
+    hsvBg.x *= -1.0;
     background.rgb = hsv2rgb(hsvBg);
 
     color.xyz = mix(background.xyz, color.xyz, 0.75);