diff --git a/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.c b/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.c
index 878783fd3f3..89203d01964 100644
--- a/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.c
+++ b/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.c
@@ -215,6 +215,13 @@ spirv_builder_emit_decoration(struct spirv_builder *b, SpvId target,
    emit_decoration(b, target, decoration, NULL, 0);
 }
 
+void
+spirv_builder_emit_input_attachment_index(struct spirv_builder *b, SpvId target, uint32_t id)
+{
+   uint32_t args[] = { id };
+   emit_decoration(b, target, SpvDecorationInputAttachmentIndex, args, ARRAY_SIZE(args));
+}
+
 void
 spirv_builder_emit_specid(struct spirv_builder *b, SpvId target, uint32_t id)
 {
diff --git a/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.h b/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.h
index 6ad3064ced6..d18c101b394 100644
--- a/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.h
+++ b/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.h
@@ -89,6 +89,9 @@ void
 spirv_builder_emit_decoration(struct spirv_builder *b, SpvId target,
                               SpvDecoration decoration);
 
+void
+spirv_builder_emit_input_attachment_index(struct spirv_builder *b, SpvId target, uint32_t id);
+
 void
 spirv_builder_emit_specid(struct spirv_builder *b, SpvId target, uint32_t id);