diff --git a/libs/vkd3d-shader/glsl.c b/libs/vkd3d-shader/glsl.c
index 3e8dd2c4..3e482a5f 100644
--- a/libs/vkd3d-shader/glsl.c
+++ b/libs/vkd3d-shader/glsl.c
@@ -79,6 +79,7 @@ static void vkd3d_glsl_handle_instruction(struct vkd3d_glsl_generator *generator
         case VKD3DSIH_DCL_INPUT:
         case VKD3DSIH_DCL_OUTPUT:
         case VKD3DSIH_DCL_OUTPUT_SIV:
+        case VKD3DSIH_NOP:
             break;
         case VKD3DSIH_RET:
             shader_glsl_ret(generator, instruction);