diff --git a/code/__HELPERS/icons.dm b/code/__HELPERS/icons.dm
index 4a60dd23c60..acb03151f1d 100644
--- a/code/__HELPERS/icons.dm
+++ b/code/__HELPERS/icons.dm
@@ -1477,6 +1477,12 @@ GLOBAL_LIST_EMPTY(transformation_animation_objects)
 
 /// Returns a list containing the width and height of an icon file
 /proc/get_icon_dimensions(icon_path)
+	// Icons can be a real file(), a rsc backed file(), a dynamic rsc (dyn.rsc) reference (known as a cache reference in byond docs), or an /icon which is pointing to one of those.
+	// Runtime generated dynamic icons are an unbounded concept cache identity wise, the same icon can exist millions of ways and holding them in a list as a key can lead to unbounded memory usage if called often by consumers.
+	// Check distinctly that this is something that has this unspecified concept, and thus that we should not cache.
+	if (!isfile(icon_path) || !length("[icon_path]"))
+		var/icon/my_icon = icon(icon_path)
+		return list("width" = my_icon.Width(), "height" = my_icon.Height())
 	if (isnull(GLOB.icon_dimensions[icon_path]))
 		var/icon/my_icon = icon(icon_path)
 		GLOB.icon_dimensions[icon_path] = list("width" = my_icon.Width(), "height" = my_icon.Height())