diff --git a/apps/openmw-mp/Script/Functions/Objects.cpp b/apps/openmw-mp/Script/Functions/Objects.cpp
index 8a6d9757c..f569b8c58 100644
--- a/apps/openmw-mp/Script/Functions/Objects.cpp
+++ b/apps/openmw-mp/Script/Functions/Objects.cpp
@@ -404,7 +404,7 @@ void ObjectFunctions::SetObjectSummonState(bool summonState) noexcept
     tempObject.isSummon = summonState;
 }
 
-void ObjectFunctions::SetObjectSummonDuration(float summonDuration) noexcept
+void ObjectFunctions::SetObjectSummonDuration(double summonDuration) noexcept
 {
     tempObject.summonDuration = summonDuration;
 }
diff --git a/apps/openmw-mp/Script/Functions/Objects.hpp b/apps/openmw-mp/Script/Functions/Objects.hpp
index 759fe4684..ee8ce3bb0 100644
--- a/apps/openmw-mp/Script/Functions/Objects.hpp
+++ b/apps/openmw-mp/Script/Functions/Objects.hpp
@@ -790,7 +790,7 @@ public:
     * \param summonDuration The summon duration.
     * \return void
     */
-    static void SetObjectSummonDuration(float summonDuration) noexcept;
+    static void SetObjectSummonDuration(double summonDuration) noexcept;
 
     /**
     * \brief Set the player ID of the summoner of the temporary object stored on the server.