diff --git a/src/runner_doiact_vec.c b/src/runner_doiact_vec.c
index dd0baefcfa644d6f8b3174d3f75424164cbcbbc4..79df48a2378fff3e784fe9652397be4903d295d2 100644
--- a/src/runner_doiact_vec.c
+++ b/src/runner_doiact_vec.c
@@ -703,6 +703,8 @@ __attribute__((always_inline)) INLINE void runner_doself2_force_vec(
         cell_cache->rho[i] = 1.f;
         cell_cache->grad_h[i] = 1.f;
         cell_cache->pOrho2[i] = 1.f;
+        cell_cache->balsara[i] = 1.f;
+        cell_cache->soundspeed[i] = 1.f;
       }
     }