diff --git a/src/runner_doiact_vec.c b/src/runner_doiact_vec.c
index 6a667c4f56f0516e12a04a3471083f35309a343d..fd585e331dfcb6ec9626e3343da885d69ee6d7a1 100644
--- a/src/runner_doiact_vec.c
+++ b/src/runner_doiact_vec.c
@@ -700,6 +700,8 @@ __attribute__((always_inline)) INLINE void runner_doself2_force_vec(
         cell_cache->y[i] = piy.f[0];
         cell_cache->z[i] = piz.f[0];
         cell_cache->h[i] = 1.f;
+        cell_cache->rho[i] = 1.f;
+        cell_cache->grad_h[i] = 1.f;
       }
     }