diff --git a/data/json/mapgen/lab/lab_modular/lab_nests_modular/lab_nested_security.json b/data/json/mapgen/lab/lab_modular/lab_nests_modular/lab_nested_security.json
index b4c2f3a243999..4b88a5cf0086e 100644
--- a/data/json/mapgen/lab/lab_modular/lab_nests_modular/lab_nested_security.json
+++ b/data/json/mapgen/lab/lab_modular/lab_nests_modular/lab_nested_security.json
@@ -673,23 +673,23 @@
       "mapgensize": [ 14, 14 ],
       "rotation": [ 0, 3 ],
       "rows": [
-        "ɜ|    |       ",
+        "!|    |       ",
         "||    |       ",
         "||    |       ",
-        "ɜ|    |       ",
+        "!|    |       ",
         "||    |       ",
         "||    |       ",
-        "ɜ|    |       ",
+        "!|    |       ",
         "||    |       ",
         "||    |       ",
-        "ɜ|    |       ",
+        "!|    |       ",
         "||    |       ",
         "||    |       ",
-        "ɜ|    |       ",
+        "!|    |       ",
         "||    |       "
       ],
       "palettes": [ "lab_common_palette", "lab_security_palette" ],
-      "monster": { "ɜ": { "monster": "mon_turret_riot" } },
+      "monster": { "!": { "monster": "mon_turret_riot" } },
       "place_nested": [
         {
           "chunks": [ [ "null", 30 ], [ "lab_security_sandbag_EW_1", 50 ], [ "lab_security_sandbag_EW_2", 50 ] ],
@@ -715,23 +715,23 @@
       "mapgensize": [ 14, 14 ],
       "rotation": [ 0, 3 ],
       "rows": [
-        "    |ɜ        ",
+        "    |!        ",
         "    ||        ",
         "    ||        ",
-        "    |ɜ        ",
+        "    |!        ",
         "    ||        ",
         "    ||        ",
-        "    |ɜ        ",
+        "    |!        ",
         "    ||        ",
         "    ||        ",
-        "    |ɜ        ",
+        "    |!        ",
         "    ||        ",
         "    ||        ",
-        "    |ɜ        ",
+        "    |!        ",
         "    ||        "
       ],
       "palettes": [ "lab_common_palette", "lab_security_palette" ],
-      "monster": { "ɜ": { "monster": "mon_turret_riot" } },
+      "monster": { "!": { "monster": "mon_turret_riot" } },
       "place_nested": [
         {
           "chunks": [ [ "null", 30 ], [ "lab_security_sandbag_EW_1", 50 ], [ "lab_security_sandbag_EW_2", 50 ] ],