diff --git a/code/datums/tgs_event_handler.dm b/code/datums/tgs_event_handler.dm
index 3979164b4b6..434450b9bec 100644
--- a/code/datums/tgs_event_handler.dm
+++ b/code/datums/tgs_event_handler.dm
@@ -5,8 +5,8 @@
 	switch(event_code)
 		if(TGS_EVENT_REBOOT_MODE_CHANGE)
 			var/list/reboot_mode_lookup = list ("[TGS_REBOOT_MODE_NORMAL]" = "be normal", "[TGS_REBOOT_MODE_SHUTDOWN]" = "shutdown the server", "[TGS_REBOOT_MODE_RESTART]" = "hard restart the server")
-			var old_reboot_mode = args[2]
-			var new_reboot_mode = args[3]
+			var/old_reboot_mode = args[2]
+			var/new_reboot_mode = args[3]
 			message_admins("TGS: Reboot will no longer [reboot_mode_lookup["[old_reboot_mode]"]], it will instead [reboot_mode_lookup["[new_reboot_mode]"]]")
 		if(TGS_EVENT_PORT_SWAP)
 			message_admins("TGS: Changing port from [world.port] to [args[2]]")
diff --git a/code/game/gamemodes/dynamic/dynamic_rulesets_roundstart.dm b/code/game/gamemodes/dynamic/dynamic_rulesets_roundstart.dm
index c69da55d038..373e478533e 100644
--- a/code/game/gamemodes/dynamic/dynamic_rulesets_roundstart.dm
+++ b/code/game/gamemodes/dynamic/dynamic_rulesets_roundstart.dm
@@ -337,7 +337,7 @@
 	return TRUE
 
 /datum/dynamic_ruleset/roundstart/nuclear/round_result()
-	var result = nuke_team.get_result()
+	var/result = nuke_team.get_result()
 	switch(result)
 		if(NUKE_RESULT_FLUKE)
 			SSticker.mode_result = "loss - syndicate nuked - disk secured"
diff --git a/code/game/gamemodes/nuclear/nuclear.dm b/code/game/gamemodes/nuclear/nuclear.dm
index 0acf0c56149..247a3669cdd 100644
--- a/code/game/gamemodes/nuclear/nuclear.dm
+++ b/code/game/gamemodes/nuclear/nuclear.dm
@@ -64,7 +64,7 @@
 
 /datum/game_mode/nuclear/set_round_result()
 	..()
-	var result = nuke_team.get_result()
+	var/result = nuke_team.get_result()
 	switch(result)
 		if(NUKE_RESULT_FLUKE)
 			SSticker.mode_result = "loss - syndicate nuked - disk secured"
diff --git a/code/modules/antagonists/traitor/datum_traitor.dm b/code/modules/antagonists/traitor/datum_traitor.dm
index 4d406c3a782..07c088ac998 100644
--- a/code/modules/antagonists/traitor/datum_traitor.dm
+++ b/code/modules/antagonists/traitor/datum_traitor.dm
@@ -351,8 +351,8 @@
 
 /// Proc detailing contract kit buys/completed contracts/additional info
 /datum/antagonist/traitor/proc/contractor_round_end()
-	var result = ""
-	var total_spent_rep = 0
+	var/result = ""
+	var/total_spent_rep = 0
 
 	var/completed_contracts = contractor_hub.contracts_completed
 	var/tc_total = contractor_hub.contract_TC_payed_out + contractor_hub.contract_TC_to_redeem
@@ -389,7 +389,7 @@
 	var/phrases = jointext(GLOB.syndicate_code_phrase, ", ")
 	var/responses = jointext(GLOB.syndicate_code_response, ", ")
 
-	var message = "<br><b>The code phrases were:</b> <span class='bluetext'>[phrases]</span><br>\
+	var/message = "<br><b>The code phrases were:</b> <span class='bluetext'>[phrases]</span><br>\
 					<b>The code responses were:</b> <span class='redtext'>[responses]</span><br>"
 
 	return message
diff --git a/code/modules/detectivework/scanner.dm b/code/modules/detectivework/scanner.dm
index 5cf9de3be19..c35e5fee7a6 100644
--- a/code/modules/detectivework/scanner.dm
+++ b/code/modules/detectivework/scanner.dm
@@ -46,7 +46,7 @@
 	var/obj/item/paper/P = new(get_turf(src))
 
 	//This could be a global count like sec and med record printouts. See GLOB.data_core.medicalPrintCount AKA datacore.dm
-	var frNum = ++forensicPrintCount
+	var/frNum = ++forensicPrintCount
 
 	P.name = text("FR-[] 'Forensic Record'", frNum)
 	P.info = text("<center><B>Forensic Record - (FR-[])</B></center><HR><BR>", frNum)
diff --git a/code/modules/reagents/chemistry/machinery/chem_heater.dm b/code/modules/reagents/chemistry/machinery/chem_heater.dm
index c34b78f894e..a4d2b0df089 100644
--- a/code/modules/reagents/chemistry/machinery/chem_heater.dm
+++ b/code/modules/reagents/chemistry/machinery/chem_heater.dm
@@ -105,7 +105,7 @@
 	data["beakerCurrentVolume"] = beaker ? beaker.reagents.total_volume : null
 	data["beakerMaxVolume"] = beaker ? beaker.volume : null
 
-	var beakerContents[0]
+	var/beakerContents[0]
 	if(beaker)
 		for(var/datum/reagent/R in beaker.reagents.reagent_list)
 			beakerContents.Add(list(list("name" = R.name, "volume" = R.volume))) // list in a list because Byond merges the first list...