diff --git a/src/main/kotlin/net/axay/kspigot/gui/elements/GUISpaceCompound.kt b/src/main/kotlin/net/axay/kspigot/gui/elements/GUISpaceCompound.kt
index 522449bc..019d8da7 100644
--- a/src/main/kotlin/net/axay/kspigot/gui/elements/GUISpaceCompound.kt
+++ b/src/main/kotlin/net/axay/kspigot/gui/elements/GUISpaceCompound.kt
@@ -156,7 +156,7 @@ abstract class AbstractGUISpaceCompound<T : ForInventory, E> internal constructo
     /**
      * Adds new elements to the compound.
      */
-    fun addContent(elements: Collection<E>) {
+    fun addContent(elements: Iterable<E>) {
 
         content += elements
         contentSort.invoke()