diff --git a/.gitignore b/.gitignore
index a85df2a..8968fe6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,4 @@
 /cabal.project.local
 /doc/
 bench*.html
+.aider*
diff --git a/IntervalMap.cabal b/IntervalMap.cabal
index c421323..0c1ce95 100644
--- a/IntervalMap.cabal
+++ b/IntervalMap.cabal
@@ -1,5 +1,5 @@
 Name:                IntervalMap
-Version:             0.6.2.3
+Version:             0.6.2.4
 Stability:           experimental
 Synopsis:            Containers for intervals, with efficient search.
 Homepage:            https://www.chr-breitkopf.de/comp/IntervalMap
@@ -12,7 +12,7 @@ Copyright:           2011-2026 Christoph Breitkopf
 Category:            Data
 Build-type:          Simple
 Cabal-version:       >= 1.10
-Tested-With:         GHC ==8.0.2, GHC ==8.2.1, GHC ==8.4.1, GHC ==8.6.5, GHC ==8.8.3, GHC ==9.0.2, GHC ==9.6.7
+Tested-With:         GHC ==8.0.2, GHC ==8.2.1, GHC ==8.4.1, GHC ==8.6.5, GHC ==8.8.3, GHC ==9.0.2, GHC ==9.6.7, GHC ==9.12.4
 Description:
                      Ordered containers of intervals, with efficient search
                      for all keys containing a point or overlapping an interval.
diff --git a/bench/RBColorIntBase.hs b/bench/RBColorIntBase.hs
index 727b5be..953c8dc 100644
--- a/bench/RBColorIntBase.hs
+++ b/bench/RBColorIntBase.hs
@@ -64,7 +64,7 @@ module RBColorIntBase (
 
             ) where
 
-import Prelude hiding (null, lookup, map, filter, foldr, foldl)
+import Prelude hiding (Foldable(..), lookup, map, filter)
 import Data.Bits (shiftR, (.&.))
 import Data.Monoid (Monoid(..))
 import Control.Applicative (Applicative(..), (<$>))
@@ -423,7 +423,7 @@ data T2 a b = T2 !a !b
 fromDistinctAscList :: (Interval k e) => [(k,v)] -> IntervalMap k v
 -- exactly 2^n-1 items have height n. They can be all black
 -- from 2^n - 2^n-2 items have height n+1. The lowest "row" should be red.
-fromDistinctAscList lyst = case h (length lyst) lyst of
+fromDistinctAscList lyst = case h (L.length lyst) lyst of
                              (T2 result []) -> result
                              _ -> error "fromDistinctAscList: list not fully consumed"
   where
diff --git a/changelog b/changelog
index 29f61c5..89726f9 100644
--- a/changelog
+++ b/changelog
@@ -1,3 +1,4 @@
+0.6.2.4  Fix build error of benchmarks with ghc 9.12
 0.6.2.3  Fix benchmark broken by fingertree adding its own NFData instance
 0.6.2.2  Remove SegmentTree from benchmarks because it does not compile with current ghc/cabal
 0.6.2.1  Future-proof against potential Prelude.foldl'