diff --git a/c_tools/stacking/pruneVoids.cpp b/c_tools/stacking/pruneVoids.cpp
index cd88462..3f0f535 100644
--- a/c_tools/stacking/pruneVoids.cpp
+++ b/c_tools/stacking/pruneVoids.cpp
@@ -330,6 +330,9 @@ int main(int argc, char **argv) {
     voids[iVoid].barycenter[0] += voids[iVoid].center[0];
     voids[iVoid].barycenter[1] += voids[iVoid].center[1];
     voids[iVoid].barycenter[2] += voids[iVoid].center[2];
+    voids[iVoid].barycenter[0] = fmod(voids[iVoid].barycenter[0], boxLen[0]);
+    voids[iVoid].barycenter[1] = fmod(voids[iVoid].barycenter[1], boxLen[1]);
+    voids[iVoid].barycenter[2] = fmod(voids[iVoid].barycenter[2], boxLen[2]);
 
     if (periodicX) 
       voids[iVoid].barycenter[0] = fmod(voids[iVoid].barycenter[0], boxLen[0]);