diff --git a/resources/shaders/140/thick_lines.fs b/resources/shaders/140/thick_lines.fs
index cf963b16a..31290abdb 100644
--- a/resources/shaders/140/thick_lines.fs
+++ b/resources/shaders/140/thick_lines.fs
@@ -2,7 +2,7 @@
 
 // see as reference: https://github.com/mhalber/Lines/blob/master/geometry_shader_lines.h
 
-const vec2 aa_radius = vec2(1.0);
+const vec2 aa_radius = vec2(0.5);
 
 uniform vec4 uniform_color;
 
@@ -21,7 +21,7 @@ void main()
 	// This way the smoothing is centered around 'w'.
 
 	out_color = uniform_color;
-	float au = 1.0 - smoothstep( 1.0 - ((2.0 * aa_radius[0]) / line_width),  1.0, abs(uv.x / line_width) );
-	float av = 1.0 - smoothstep( 1.0 - ((2.0 * aa_radius[1]) / line_length), 1.0, abs(uv.y / line_length) );
+	float au = 1.0 - smoothstep(1.0 - (2.0 * aa_radius[0] / line_width),  1.0, abs(uv.x / line_width));
+	float av = 1.0 - smoothstep(1.0 - (2.0 * aa_radius[1] / line_length), 1.0, abs(uv.y / line_length));
 	out_color.a *= min(av, au);
 }
diff --git a/resources/shaders/140/thick_lines.gs b/resources/shaders/140/thick_lines.gs
index ee9060d91..dbfe400d4 100644
--- a/resources/shaders/140/thick_lines.gs
+++ b/resources/shaders/140/thick_lines.gs
@@ -5,7 +5,7 @@
 layout(lines) in;
 layout(triangle_strip, max_vertices = 4) out;
 
-const vec2 aa_radius = vec2(1.0);
+const vec2 aa_radius = vec2(0.5);
 
 uniform vec2 viewport_size;
 uniform float width;
@@ -16,26 +16,24 @@ out vec2 uv;
 
 void main()
 {
-	float u_width        = viewport_size[0];
-	float u_height       = viewport_size[1];
-	float u_aspect_ratio = u_height / u_width;
+	float u_width  = viewport_size[0];
+	float u_height = viewport_size[1];
 
 	vec2 ndc_0 = gl_in[0].gl_Position.xy / gl_in[0].gl_Position.w;
 	vec2 ndc_1 = gl_in[1].gl_Position.xy / gl_in[1].gl_Position.w;
 
-	vec2 line_vector = ndc_1 - ndc_0;
-	vec2 viewport_line_vector = line_vector * viewport_size;
+	vec2 viewport_line_vector = 0.5 * (ndc_1 - ndc_0) * viewport_size;
 	vec2 dir = normalize(viewport_line_vector);
 	vec2 normal_dir = vec2(-dir.y, dir.x);
 
-	line_width  = max(1.0, width) + aa_radius[0];
+	line_width  = max(1.0, width) + 2.0 * aa_radius[0];
 	line_length = length(viewport_line_vector) + 2.0 * aa_radius[1];
 
 	vec2 normal    = vec2(line_width / u_width, line_width / u_height) * normal_dir;
     vec2 extension = vec2(aa_radius[1] / u_width, aa_radius[1] / u_height) * dir;
 
-	float half_line_width  = line_width * 0.5;
-	float half_line_length = line_length * 0.5;
+	float half_line_width  = 0.5 * line_width;
+	float half_line_length = 0.5 * line_length;
 
 	uv = vec2(-half_line_width, half_line_length);
 	gl_Position = vec4((ndc_0 + normal - extension) * gl_in[0].gl_Position.w, gl_in[0].gl_Position.zw);