diff --git a/source/blender/draw/engines/eevee/shaders/surface_frag.glsl b/source/blender/draw/engines/eevee/shaders/surface_frag.glsl
index 3af422b3877..bf105bd907b 100644
--- a/source/blender/draw/engines/eevee/shaders/surface_frag.glsl
+++ b/source/blender/draw/engines/eevee/shaders/surface_frag.glsl
@@ -21,6 +21,11 @@ vec3 displacement_exec();
 /* Return new shading normal. */
 vec3 displacement_bump()
 {
+#  ifdef HAIR_SHADER
+  /* Not supported. */
+  return normalize(g_data.N);
+#  else
+
   vec2 dHd;
   dF_branch(dot(displacement_exec(), g_data.N + dF_impl(g_data.N)), dHd);
 
@@ -38,6 +43,7 @@ vec3 displacement_bump()
 
   float facing = FrontFacing ? 1.0 : -1.0;
   return normalize(abs(det) * g_data.N - facing * sign(det) * surfgrad);
+#  endif
 }
 
 #endif
diff --git a/source/blender/draw/engines/eevee_next/shaders/eevee_nodetree_lib.glsl b/source/blender/draw/engines/eevee_next/shaders/eevee_nodetree_lib.glsl
index 4b53375575c..965780d9bcf 100644
--- a/source/blender/draw/engines/eevee_next/shaders/eevee_nodetree_lib.glsl
+++ b/source/blender/draw/engines/eevee_next/shaders/eevee_nodetree_lib.glsl
@@ -277,7 +277,7 @@ void output_aov(vec4 color, float value, uint hash)
 /* Return new shading normal. */
 vec3 displacement_bump()
 {
-#  ifdef GPU_FRAGMENT_SHADER
+#  if defined(GPU_FRAGMENT_SHADER) && !defined(MAT_GEOM_CURVES)
   vec2 dHd;
   dF_branch(dot(nodetree_displacement(), g_data.N + dF_impl(g_data.N)), dHd);