diff --git a/code/__DEFINES/inventory.dm b/code/__DEFINES/inventory.dm
index fd6a7de37bf..20d429ca7c0 100644
--- a/code/__DEFINES/inventory.dm
+++ b/code/__DEFINES/inventory.dm
@@ -22,8 +22,14 @@
 //in exchange for being limited in the w_class of items that will fit
 #define BASE_STORAGE_CAPACITY(w_class) (7*(w_class-1))
 
+// "max_storage_space" Defines
+/// max_storage_space = 56
 #define DEFAULT_HOLDING_STORAGE   BASE_STORAGE_CAPACITY(9)
+/// max_storage_space = 35
 #define DEFAULT_DUFFELBAG_STORAGE BASE_STORAGE_CAPACITY(6)
+/// max_storage_space = 28
 #define DEFAULT_BACKPACK_STORAGE  BASE_STORAGE_CAPACITY(5)
+/// max_storage_space = 21
 #define DEFAULT_LARGEBOX_STORAGE  BASE_STORAGE_CAPACITY(4)
+/// max_storage_space = 14
 #define DEFAULT_BOX_STORAGE       BASE_STORAGE_CAPACITY(3)
diff --git a/code/game/objects/items/weapons/storage/firstaid.dm b/code/game/objects/items/weapons/storage/firstaid.dm
index 51348921dd9..6178bce4265 100644
--- a/code/game/objects/items/weapons/storage/firstaid.dm
+++ b/code/game/objects/items/weapons/storage/firstaid.dm
@@ -15,7 +15,7 @@
 
 /obj/item/storage/firstaid/empty
 	desc = "It's a first-aid kit. Comes with nothing, so feel free to put your own stuff in it."
-	max_storage_space = 16 // So empty first-aid kits don't start with less space than filled ones.
+	max_storage_space = DEFAULT_BOX_STORAGE // So empty first-aid kits don't start with less space than filled ones.
 
 /obj/item/storage/firstaid/regular
 	starts_with = list(
diff --git a/html/changelogs/SleepyGemmy-firstaid_kit_define.yml b/html/changelogs/SleepyGemmy-firstaid_kit_define.yml
new file mode 100644
index 00000000000..a836fb6ab40
--- /dev/null
+++ b/html/changelogs/SleepyGemmy-firstaid_kit_define.yml
@@ -0,0 +1,6 @@
+author: SleepyGemmy
+
+delete-after: True
+
+changes:
+  - bugfix: "Made first-aid kits use a define for its max storage space."