diff --git a/coil-core/src/androidMain/kotlin/coil3/request/imageRequests.android.kt b/coil-core/src/androidMain/kotlin/coil3/request/imageRequests.android.kt
index 47dd97f43..9a76b5646 100644
--- a/coil-core/src/androidMain/kotlin/coil3/request/imageRequests.android.kt
+++ b/coil-core/src/androidMain/kotlin/coil3/request/imageRequests.android.kt
@@ -55,7 +55,7 @@ fun ImageRequest.Builder.transformations(transformations: List<Transformation>)
     extras[transformationsKey] = transformations.toImmutableList()
 
     var index = 0
-    val memoryCacheKey = transformations.joinToString { "${++index}:${it.cacheKey}" }
+    val memoryCacheKey = transformations.joinToString { "${index++}:${it.cacheKey}" }
     memoryCacheKeyExtra("coil#transformations", memoryCacheKey)
 }