diff --git a/code/controllers/subsystem/dbcore.dm b/code/controllers/subsystem/dbcore.dm
index 5555525262..8251a8acba 100644
--- a/code/controllers/subsystem/dbcore.dm
+++ b/code/controllers/subsystem/dbcore.dm
@@ -37,6 +37,8 @@ SUBSYSTEM_DEF(dbcore)
 			message_admins("Database schema ([db_major].[db_minor]) doesn't match the latest schema version ([DB_MAJOR_VERSION].[DB_MINOR_VERSION]), this may lead to undefined behaviour or errors")
 		if(2)
 			message_admins("Could not get schema version from database")
+	
+	return ..()
 
 	
 /datum/controller/subsystem/dbcore/Recover()
diff --git a/code/controllers/subsystem/pathfinder.dm b/code/controllers/subsystem/pathfinder.dm
index 9bcdc4595e..2cd52a4da1 100644
--- a/code/controllers/subsystem/pathfinder.dm
+++ b/code/controllers/subsystem/pathfinder.dm
@@ -14,6 +14,8 @@ SUBSYSTEM_DEF(pathfinder)
 	free = 1
 	flow = new()
 	flow.len=lcount
+	
+	return ..()
 
 /datum/controller/subsystem/pathfinder/proc/getfree(atom/M)
 	if(run < lcount)
diff --git a/code/controllers/subsystem/stickyban.dm b/code/controllers/subsystem/stickyban.dm
index 371cf22b3b..189efa99fe 100644
--- a/code/controllers/subsystem/stickyban.dm
+++ b/code/controllers/subsystem/stickyban.dm
@@ -30,3 +30,5 @@ SUBSYSTEM_DEF(stickyban)
 	
 	for (var/bannedckey in cache)
 		world.SetConfig("ban", bannedckey, list2stickyban(cache[bannedckey]))
+
+	return ..()
diff --git a/code/controllers/subsystem/traumas.dm b/code/controllers/subsystem/traumas.dm
index 3ea850260a..e3d783d231 100644
--- a/code/controllers/subsystem/traumas.dm
+++ b/code/controllers/subsystem/traumas.dm
@@ -141,4 +141,6 @@ SUBSYSTEM_DEF(traumas)
 						  /datum/species/shadow))
 						 )
 
+	return ..()
+
 #undef PHOBIA_FILE
diff --git a/code/modules/unit_tests/_unit_tests.dm b/code/modules/unit_tests/_unit_tests.dm
index 862991c4b8..df1d6d6457 100644
--- a/code/modules/unit_tests/_unit_tests.dm
+++ b/code/modules/unit_tests/_unit_tests.dm
@@ -4,5 +4,9 @@
 #include "unit_test.dm"
 #include "reagent_recipe_collisions.dm"
 #include "reagent_id_typos.dm"
+<<<<<<< HEAD
 //#include "vore_tests.dm"
+=======
+#include "subsystem_init.dm"
+>>>>>>> 70beb65... Unit test to make sure all subsystems which initialize call parent (#36466)
 #endif
diff --git a/code/modules/unit_tests/subsystem_init.dm b/code/modules/unit_tests/subsystem_init.dm
new file mode 100644
index 0000000000..f768f03f78
--- /dev/null
+++ b/code/modules/unit_tests/subsystem_init.dm
@@ -0,0 +1,7 @@
+/datum/unit_test/subsystem_init/Run()
+	for(var/i in Master.subsystems)
+		var/datum/controller/subsystem/ss = i
+		if(ss.flags & SS_NO_INIT)
+			continue
+		if(!ss.initialized)
+			Fail("[ss]([ss.type]) is a subsystem meant to initialize but doesn't get set as initialized.")
\ No newline at end of file