diff --git a/src/core/virtual_sites/lb_inertialess_tracers.cpp b/src/core/virtual_sites/lb_inertialess_tracers.cpp
index 5aae5af66c..b87b2d4232 100644
--- a/src/core/virtual_sites/lb_inertialess_tracers.cpp
+++ b/src/core/virtual_sites/lb_inertialess_tracers.cpp
@@ -92,7 +92,7 @@ void IBM_UpdateParticlePositions(ParticleRange const &particles,
   // Euler integrator
   for (auto &p : particles) {
     if (p.is_virtual()) {
-      for (int axis = 0; axis < 2; axis++) {
+      for (int axis = 0; axis < 3; axis++) {
 #ifdef EXTERNAL_FORCES
         if (not p.is_fixed_along(axis))
 #endif