diff --git a/src/nouveau/compiler/nak_nir_lower_cf.c b/src/nouveau/compiler/nak_nir_lower_cf.c
index 01276c4a4db..817f6de4d73 100644
--- a/src/nouveau/compiler/nak_nir_lower_cf.c
+++ b/src/nouveau/compiler/nak_nir_lower_cf.c
@@ -442,6 +442,14 @@ lower_cf_func(nir_function *func)
    /* We use this in block_is_merge() */
    nir_metadata_require(old_impl, nir_metadata_dominance | nir_metadata_divergence);
 
+   /* We get rid of single source phis, because they would be converted to phis
+    * with undef after lowering regs to SSA.
+    */
+   nir_foreach_block(block, old_impl) {
+      if (nir_block_num_preds(block) <= 1)
+         nir_remove_single_src_phis_block(block);
+   }
+
    /* First, we temporarily get rid of SSA.  This will make all our block
     * motion way easier.  Ask the pass to place reg writes directly in the
     * immediate predecessors of the phis instead of trying to be clever.