diff --git a/src/particles.f90 b/src/particles.f90
index 82ffade896859e5474159f76b55d880ad0b75aa9..7b1586d9a14b6f3faaa1ad9328583fbce66ad9ac 100644
--- a/src/particles.f90
+++ b/src/particles.f90
@@ -13,7 +13,7 @@
         if (elForceScheme.ne.2) call forcesGauss
         if (elForceScheme.ne.1) call forcesCoulomb
         call particlesVelocity
-!        call particlesCollide
+        call particlesCollide
         call particlesTransport    !particles from neighbour gc added
         call chargeDensity
         call momentumCoupling !particles from neighbour gc removed