diff --git a/src/gl/scene/gl_sprite.cpp b/src/gl/scene/gl_sprite.cpp
index 0a672737ed..b7a48852cc 100644
--- a/src/gl/scene/gl_sprite.cpp
+++ b/src/gl/scene/gl_sprite.cpp
@@ -310,6 +310,7 @@ void GLSprite::Draw(int pass)
 			gl_SetFog(foglevel, rel, &Colormap, additivefog);
 			gl_RenderState.SetFixedColormap(CM_FOGLAYER);
 			gl_RenderState.BlendEquation(GL_FUNC_ADD);
+			gl_RenderState.BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 			gl_RenderState.Apply();
 
 			glBegin(GL_TRIANGLE_STRIP);
diff --git a/wadsrc/static/shaders/glsl/main_foglayer.fp b/wadsrc/static/shaders/glsl/main_foglayer.fp
index 5d18eeee5d..4b1bdf4181 100644
--- a/wadsrc/static/shaders/glsl/main_foglayer.fp
+++ b/wadsrc/static/shaders/glsl/main_foglayer.fp
@@ -54,6 +54,6 @@ void main()
 	fogfactor = exp2 (fogparm.z * fogdist);
 	
 	vec4 frag = Process(vec4(1.0,1.0,1.0,1.0));
-	gl_FragColor = vec4(fogcolor.rgb, (1.0 - fogfactor) * frag.a * 0.75);
+	gl_FragColor = vec4(fogcolor.rgb, (1.0 - fogfactor) * frag.a * 0.75 * glColor.a);
 }