diff --git a/src/compiler/nir/nir_serialize.c b/src/compiler/nir/nir_serialize.c
index 5d783ec3c55..5f6cec0b119 100644
--- a/src/compiler/nir/nir_serialize.c
+++ b/src/compiler/nir/nir_serialize.c
@@ -1518,7 +1518,7 @@ read_phi(read_ctx *ctx, nir_block *blk, union packed_instr header)
        * we have to set the parent_instr manually.  It doesn't really matter
        * when we do it, so we might as well do it here.
        */
-      src->src.parent_instr = &phi->instr;
+      nir_src_set_parent_instr(&src->src, &phi->instr);
 
       /* Stash it in the list of phi sources.  We'll walk this list and fix up
        * sources at the very end of read_function_impl.