diff --git a/src/nouveau/compiler/nak_nir.c b/src/nouveau/compiler/nak_nir.c
index 39af46b48bc..5eef74951c5 100644
--- a/src/nouveau/compiler/nak_nir.c
+++ b/src/nouveau/compiler/nak_nir.c
@@ -168,7 +168,7 @@ lower_bit_size_cb(const nir_instr *instr, void *_data)
 
    case nir_instr_type_phi: {
       nir_phi_instr *phi = nir_instr_as_phi(instr);
-      if (phi->def.bit_size != 32)
+      if (phi->def.bit_size != 32 && phi->def.bit_size != 1)
          return 32;
       return 0;
    }