diff --git a/tests/testPair.c b/tests/testPair.c
index e0e813f31531fb1c8d2e24e417a43ac4d07ecf7e..0e0b36a4c30abc5a8d37060c70788669f5b5710d 100644
--- a/tests/testPair.c
+++ b/tests/testPair.c
@@ -276,6 +276,9 @@ int main(int argc, char *argv[]) {
   }
 
   space.periodic = 0;
+  space.dim[0] = 3.;
+  space.dim[1] = 3.;
+  space.dim[2] = 3.;
 
   engine.s = &space;
   engine.time = 0.1f;