diff --git a/src/engine/engine_util_sparse.h b/src/engine/engine_util_sparse.h
index 48b41979..f1f46f4a 100644
--- a/src/engine/engine_util_sparse.h
+++ b/src/engine/engine_util_sparse.h
@@ -18,6 +18,7 @@
 #include <mujoco/mjdata.h>
 #include <mujoco/mjexport.h>
 #include <mujoco/mjtnum.h>
+#include "engine/engine_util_sparse_avx.h"  // IWYU pragma: keep
 
 #ifdef __cplusplus
 extern "C" {