diff --git a/.github/workflows/dmi5.yml b/.github/workflows/dmi5.yml
new file mode 100644
index 00000000000..e021d47adb1
--- /dev/null
+++ b/.github/workflows/dmi5.yml
@@ -0,0 +1,14 @@
+name: Check for DMI5
+
+on: pull_request_target
+
+jobs:
+  check-dmi5:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ParadiseSS13/DMI5Checker@v1
+      with:
+        icons-path: 'icons'
+
diff --git a/code/game/verbs/ooc.dm b/code/game/verbs/ooc.dm
index 02a29f4de56..45cbd471051 100644
--- a/code/game/verbs/ooc.dm
+++ b/code/game/verbs/ooc.dm
@@ -84,7 +84,7 @@ GLOBAL_VAR_INIT(admin_ooc_colour, "#b82e00")
 
 			if(donator_level > 0)
 				if((prefs.toggles & PREFTOGGLE_DONATOR_PUBLIC))
-					var/icon/donator = icon('icons/ooc_tag_16x.dmi', "donator")
+					var/icon/donator = icon('icons/ooc_tag_16x.png')
 					display_name = "[bicon(donator)][display_name]"
 
 			if(holder)
@@ -131,7 +131,7 @@ GLOBAL_VAR_INIT(admin_ooc_colour, "#b82e00")
 
 	if(!check_rights(R_SERVER))	return
 
-	GLOB.normal_ooc_colour = DEFAULT_PLAYER_OOC_COLOUR 
+	GLOB.normal_ooc_colour = DEFAULT_PLAYER_OOC_COLOUR
 	message_admins("[key_name_admin(usr)] has reset the default player OOC color")
 	log_admin("[key_name(usr)] has reset the default player OOC color")
 
diff --git a/icons/obj/pipes/large.dmi b/icons/obj/pipes/large.dmi
index 77fb29e4dea..55aad8e2f13 100644
Binary files a/icons/obj/pipes/large.dmi and b/icons/obj/pipes/large.dmi differ
diff --git a/icons/ooc_tag_16x.dmi b/icons/ooc_tag_16x.png
similarity index 100%
rename from icons/ooc_tag_16x.dmi
rename to icons/ooc_tag_16x.png