diff --git a/configuration-ghc-901.nix b/configuration-ghc-901.nix
index 36777ad92b..79a04cf0ac 100644
--- a/configuration-ghc-901.nix
+++ b/configuration-ghc-901.nix
@@ -25,6 +25,13 @@ let
 
       # we need add ghc-api-compat to build depends,
       # since its condition tree is not evaluated under ghc 9
+
+      ghc-api-compat = hself.callHackageDirect {
+                pkg = "ghc-api-compat";
+                ver = "9.0.1";
+                sha256 = "WCK1gu6iiCAc2s2rFEqn2CkvHkITPrmDjuiGsWOWerM=";
+              } {};
+
       hiedb = addBuildDepend hsuper.hiedb hself.ghc-api-compat;
 
       blaze-textual = hself.callCabal2nix "blaze-textual"
diff --git a/flake.nix b/flake.nix
index e7409c385a..d5dc999ed1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -71,13 +71,11 @@
           tweaks = hself: hsuper:
             with haskell.lib; {
 
-              ghc-api-compat = hself.callCabal2nix "ghc-api-compat"
-                (pkgs.fetchFromGitHub {
-                  owner = "hsyl20";
-                  repo = "ghc-api-compat";
-                  rev = "8fee87eac97a538dbe81ff1ab18cff10f2f9fa15";
-                  sha256 = "byehvdxQxhNk5ZQUXeFHjAZpAze4Ct9261ro4c5acZk=";
-                }) { };
+              ghc-api-compat = hself.callHackageDirect {
+                pkg = "ghc-api-compat";
+                ver = "8.10.7";
+                sha256 = "g9/InDeQfiXCB9SK8mpl/8B5QEEobj9uqo4xe//telw=";
+              } {};
 
               lsp = hself.lsp_1_2_0_1;