diff --git a/examples/EAGLE_ICs/EAGLE_12/eagle_12.yml b/examples/EAGLE_ICs/EAGLE_12/eagle_12.yml
index 69f7ce79faf38b997b3b5b0ef7fd38977defceec..8aedb65e808bef57dbb3c5b5c4c884a09d0d602b 100644
--- a/examples/EAGLE_ICs/EAGLE_12/eagle_12.yml
+++ b/examples/EAGLE_ICs/EAGLE_12/eagle_12.yml
@@ -27,8 +27,6 @@ TimeIntegration:
 # Parameters governing the snapshots
 Snapshots:
   basename:            eagle # Common part of the name of output files
-  scale_factor_first:  0.05
-  delta_time:          1.02
   output_list_on:      1
   output_list:         ./output_list.txt
 
diff --git a/examples/EAGLE_ICs/EAGLE_25/eagle_25.yml b/examples/EAGLE_ICs/EAGLE_25/eagle_25.yml
index a9af254b7022970a3edcf12ee7a1f9a9a4f12d61..49621b089dbef9e6e5ee73fe14668313887433d6 100644
--- a/examples/EAGLE_ICs/EAGLE_25/eagle_25.yml
+++ b/examples/EAGLE_ICs/EAGLE_25/eagle_25.yml
@@ -27,8 +27,6 @@ TimeIntegration:
 # Parameters governing the snapshots
 Snapshots:
   basename:            eagle # Common part of the name of output files
-  scale_factor_first:  0.05
-  delta_time:          1.02
   output_list_on:      1
   output_list:         ./output_list.txt
 
diff --git a/examples/EAGLE_ICs/EAGLE_50/eagle_50.yml b/examples/EAGLE_ICs/EAGLE_50/eagle_50.yml
index 1f3b4ac7f41c7b299fdac3e527fb76ca8b791b9d..3b80476800cd43b8de2318d703a02af7e799d35e 100644
--- a/examples/EAGLE_ICs/EAGLE_50/eagle_50.yml
+++ b/examples/EAGLE_ICs/EAGLE_50/eagle_50.yml
@@ -27,8 +27,6 @@ TimeIntegration:
 # Parameters governing the snapshots
 Snapshots:
   basename:            eagle # Common part of the name of output files
-  scale_factor_first:  0.05
-  delta_time:          1.02
   output_list_on:      1
   output_list:         ./output_list.txt
 
diff --git a/src/engine.c b/src/engine.c
index 5e2ed48cf550659c145ec340e0a2b40ae1bbf7e8..1799d5b09332e1ef9ef13f3b2912c27c03425f47 100644
--- a/src/engine.c
+++ b/src/engine.c
@@ -4948,7 +4948,7 @@ void engine_init(struct engine *e, struct space *s, struct swift_params *params,
   e->time_first_snapshot =
       parser_get_opt_param_double(params, "Snapshots:time_first", 0.);
   e->delta_time_snapshot =
-      parser_get_param_double(params, "Snapshots:delta_time");
+      parser_get_opt_param_double(params, "Snapshots:delta_time", -1.);
   e->ti_next_snapshot = 0;
   parser_get_param_string(params, "Snapshots:basename", e->snapshot_base_name);
   e->snapshot_compression =