diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index 54323232570..486cf4639ce 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -2045,6 +2045,9 @@ ir_to_mesa_visitor::visit(ir_texture *ir)
       ir->lod_info.grad.dPdy->accept(this);
       dy = this->result;
       break;
+   case ir_txf_ms:
+      assert(!"Unexpected ir_txf_ms opcode");
+      break;
    }
 
    const glsl_type *sampler_type = ir->sampler->type;