diff --git a/CHANGELOG.md b/CHANGELOG.md
index c11d92900..4042326d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -109,6 +109,7 @@
     Bug #4604: Picking up gold from the ground only makes 1 grabbed
     Bug #4607: Scaling for animated collision shapes is applied twice
     Bug #4608: Falling damage is applied twice
+    Bug #4611: Instant magic effects have 0 duration in custom spell cost calculations unlike vanilla
     Bug #4614: Crash due to division by zero when FlipController has no textures
     Bug #4615: Flicker effects for light sources are handled incorrectly
     Bug #4617: First person sneaking offset is not applied while the character is in air
diff --git a/apps/openmw/mwmechanics/spellcasting.cpp b/apps/openmw/mwmechanics/spellcasting.cpp
index b857c6d7e..14dfac283 100644
--- a/apps/openmw/mwmechanics/spellcasting.cpp
+++ b/apps/openmw/mwmechanics/spellcasting.cpp
@@ -65,7 +65,7 @@ namespace MWMechanics
             maxMagn = effect.mMagnMax;
         }
 
-        int duration = 0;
+        int duration = 1;
         if (!(magicEffect->mData.mFlags & ESM::MagicEffect::NoDuration))
             duration = effect.mDuration;