diff --git a/src/runner_doiact_vec.c b/src/runner_doiact_vec.c
index fd585e331dfcb6ec9626e3343da885d69ee6d7a1..dd0baefcfa644d6f8b3174d3f75424164cbcbbc4 100644
--- a/src/runner_doiact_vec.c
+++ b/src/runner_doiact_vec.c
@@ -702,6 +702,7 @@ __attribute__((always_inline)) INLINE void runner_doself2_force_vec(
         cell_cache->h[i] = 1.f;
         cell_cache->rho[i] = 1.f;
         cell_cache->grad_h[i] = 1.f;
+        cell_cache->pOrho2[i] = 1.f;
       }
     }