diff --git a/libs/vkd3d-shader/glsl.c b/libs/vkd3d-shader/glsl.c
index 3eb420306..0a91024a8 100644
--- a/libs/vkd3d-shader/glsl.c
+++ b/libs/vkd3d-shader/glsl.c
@@ -421,6 +421,9 @@ static void shader_glsl_print_src(struct vkd3d_string_buffer *buffer, struct vkd
         case VKD3DSPSM_ABS:
             vkd3d_string_buffer_printf(buffer, "abs(%s)", str->buffer);
             break;
+        case VKD3DSPSM_ABSNEG:
+            vkd3d_string_buffer_printf(buffer, "-abs(%s)", str->buffer);
+            break;
         default:
             vkd3d_string_buffer_printf(buffer, "<unhandled modifier %#x>(%s)",
                     vsir_src->modifiers, str->buffer);
diff --git a/tests/hlsl/abs.shader_test b/tests/hlsl/abs.shader_test
index 5b2b8b510..79e003df8 100644
--- a/tests/hlsl/abs.shader_test
+++ b/tests/hlsl/abs.shader_test
@@ -82,5 +82,5 @@ f2201000 00000000 468e2080 c1000000 00000000 00000000 3e000001 53544154
 
 [test]
 uniform 0 float4 1.0 -3.0 10.0 -100.0
-todo(msl | glsl) draw quad
+todo(msl) draw quad
 probe (0, 0) rgba(-1.0, -3.0, -10.0, -100.0)