diff --git a/examples/main.c b/examples/main.c
index 70bf3792b82f590d60779acb1726ff71a027253c..8c4e6f9836aaac83a1e6f94de51d86967f7cb81f 100644
--- a/examples/main.c
+++ b/examples/main.c
@@ -360,7 +360,7 @@ int main(int argc, char *argv[]) {
 
   /* Initialise the hydro properties */
   struct hydro_props hydro_properties;
-  hydro_props_init(&hydro_properties, params);
+  if(with_hydro) hydro_props_init(&hydro_properties, params);
 
   /* Read particles and space information from (GADGET) ICs */
   char ICfileName[200] = "";