diff --git a/source/blender/nodes/shader/nodes/node_shader_curves.cc b/source/blender/nodes/shader/nodes/node_shader_curves.cc
index a7df66a36c5..e98279f8183 100644
--- a/source/blender/nodes/shader/nodes/node_shader_curves.cc
+++ b/source/blender/nodes/shader/nodes/node_shader_curves.cc
@@ -257,6 +257,7 @@ class CurveRGBFunction : public mf::MultiFunction {
       if (fac[i] != 1.0f) {
         interp_v3_v3v3(col_out[i], col_in[i], col_out[i], fac[i]);
       }
+      col_out[i].a = 1.0f;
     });
   }
 };