diff --git a/src/nouveau/codegen/nv50_ir_peephole.cpp b/src/nouveau/codegen/nv50_ir_peephole.cpp
index 4e2b3e6f52c..9088e614f7e 100644
--- a/src/nouveau/codegen/nv50_ir_peephole.cpp
+++ b/src/nouveau/codegen/nv50_ir_peephole.cpp
@@ -53,7 +53,7 @@ Instruction::isNop() const
       if (!getDef(0)->equals(getSrc(0)))
          return false;
       if (op == OP_UNION)
-         if (!def(0).rep()->equals(getSrc(1)))
+         if (!getDef(0)->equals(getSrc(1)))
             return false;
       return true;
    }