diff --git a/source/blender/gpu/shaders/gpu_shader_3D_polyline_frag.glsl b/source/blender/gpu/shaders/gpu_shader_3D_polyline_frag.glsl
index f912bad8a14..f177e5f35fa 100644
--- a/source/blender/gpu/shaders/gpu_shader_3D_polyline_frag.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_3D_polyline_frag.glsl
@@ -9,7 +9,8 @@ void main()
 #endif
   fragColor = interp.final_color;
   if (lineSmooth) {
-    fragColor.a *= clamp((lineWidth + SMOOTH_WIDTH) * 0.5 - abs(interp.smoothline), 0.0, 1.0);
+    fragColor.a *= clamp(
+        (lineWidth + SMOOTH_WIDTH) * 0.5 - abs(interp_noperspective.smoothline), 0.0, 1.0);
   }
   fragColor = blender_srgb_to_framebuffer_space(fragColor);
 }
diff --git a/source/blender/gpu/shaders/gpu_shader_3D_polyline_geom.glsl b/source/blender/gpu/shaders/gpu_shader_3D_polyline_geom.glsl
index 6d23e03c835..719215e73b1 100644
--- a/source/blender/gpu/shaders/gpu_shader_3D_polyline_geom.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_3D_polyline_geom.glsl
@@ -32,12 +32,12 @@ void do_vertex(const int i, vec4 pos, vec2 ofs)
   interp_out.clip = interp_in[i].clip;
 #endif
 
-  interp_out.smoothline = (lineWidth + SMOOTH_WIDTH * float(lineSmooth)) * 0.5;
+  interp_noperspective_out.smoothline = (lineWidth + SMOOTH_WIDTH * float(lineSmooth)) * 0.5;
   gl_Position = pos;
   gl_Position.xy += ofs * pos.w;
   EmitVertex();
 
-  interp_out.smoothline = -(lineWidth + SMOOTH_WIDTH * float(lineSmooth)) * 0.5;
+  interp_noperspective_out.smoothline = -(lineWidth + SMOOTH_WIDTH * float(lineSmooth)) * 0.5;
   gl_Position = pos;
   gl_Position.xy -= ofs * pos.w;
   EmitVertex();
diff --git a/source/blender/gpu/shaders/gpu_shader_3D_polyline_vert_no_geom.glsl b/source/blender/gpu/shaders/gpu_shader_3D_polyline_vert_no_geom.glsl
index d546f98d165..2adab6f7a35 100644
--- a/source/blender/gpu/shaders/gpu_shader_3D_polyline_vert_no_geom.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_3D_polyline_vert_no_geom.glsl
@@ -45,7 +45,7 @@ void do_vertex(int index, vec4 pos, vec2 ofs, float flip)
   interp.clip = clip_g[index];
 #endif
 
-  interp.smoothline = flip * (lineWidth + SMOOTH_WIDTH * float(lineSmooth)) * 0.5;
+  interp_noperspective.smoothline = flip * (lineWidth + SMOOTH_WIDTH * float(lineSmooth)) * 0.5;
   gl_Position = pos;
   gl_Position.xy += flip * ofs * pos.w;
 }
diff --git a/source/blender/gpu/shaders/infos/gpu_shader_3D_polyline_info.hh b/source/blender/gpu/shaders/infos/gpu_shader_3D_polyline_info.hh
index 17b34edaf5e..4e80ccfde2f 100644
--- a/source/blender/gpu/shaders/infos/gpu_shader_3D_polyline_info.hh
+++ b/source/blender/gpu/shaders/infos/gpu_shader_3D_polyline_info.hh
@@ -11,7 +11,9 @@
 
 GPU_SHADER_INTERFACE_INFO(gpu_shader_3D_polyline_iface, "interp")
     .smooth(Type::VEC4, "final_color")
-    .smooth(Type::FLOAT, "clip")
+    .smooth(Type::FLOAT, "clip");
+
+GPU_SHADER_INTERFACE_INFO(gpu_shader_3D_polyline_noperspective_iface, "interp_noperspective")
     .no_perspective(Type::FLOAT, "smoothline");
 
 GPU_SHADER_CREATE_INFO(gpu_shader_3D_polyline)
@@ -22,8 +24,10 @@ GPU_SHADER_CREATE_INFO(gpu_shader_3D_polyline)
     .push_constant(Type::BOOL, "lineSmooth")
     .vertex_in(0, Type::VEC3, "pos")
     .vertex_out(gpu_shader_3D_polyline_iface)
+    .vertex_out(gpu_shader_3D_polyline_noperspective_iface)
     .geometry_layout(PrimitiveIn::LINES, PrimitiveOut::TRIANGLE_STRIP, 4)
     .geometry_out(gpu_shader_3D_polyline_iface)
+    .geometry_out(gpu_shader_3D_polyline_noperspective_iface)
     .fragment_out(0, Type::VEC4, "fragColor")
     .vertex_source("gpu_shader_3D_polyline_vert.glsl")
     .geometry_source("gpu_shader_3D_polyline_geom.glsl")
@@ -38,6 +42,7 @@ GPU_SHADER_CREATE_INFO(gpu_shader_3D_polyline_no_geom)
     .push_constant(Type::BOOL, "lineSmooth")
     .vertex_in(0, Type::VEC3, "pos")
     .vertex_out(gpu_shader_3D_polyline_iface)
+    .vertex_out(gpu_shader_3D_polyline_noperspective_iface)
     .fragment_out(0, Type::VEC4, "fragColor")
     .vertex_source("gpu_shader_3D_polyline_vert_no_geom.glsl")
     .fragment_source("gpu_shader_3D_polyline_frag.glsl")