diff --git a/pkgs/development/coq-modules/hierarchy-builder/default.nix b/pkgs/development/coq-modules/hierarchy-builder/default.nix
index 6f15fc80388e..fb7de66f16e6 100644
--- a/pkgs/development/coq-modules/hierarchy-builder/default.nix
+++ b/pkgs/development/coq-modules/hierarchy-builder/default.nix
@@ -5,7 +5,7 @@ with lib; let hb = mkCoqDerivation {
   owner = "math-comp";
   inherit version;
   defaultVersion = with versions; switch coq.coq-version [
-    { case = isGe "8.15"; out = "1.2.1"; }
+    { case = isEq "8.15"; out = "1.2.1"; }
     { case = range "8.13" "8.14"; out = "1.2.0"; }
     { case = range "8.12" "8.13"; out = "1.1.0"; }
     { case = isEq "8.11";         out = "0.10.0"; }
diff --git a/pkgs/development/coq-modules/trakt/default.nix b/pkgs/development/coq-modules/trakt/default.nix
index 671fc4013695..96ba2f808a3b 100644
--- a/pkgs/development/coq-modules/trakt/default.nix
+++ b/pkgs/development/coq-modules/trakt/default.nix
@@ -10,7 +10,7 @@ mkCoqDerivation {
 
   inherit version;
   defaultVersion = with versions; switch [ coq.version ] [
-    { cases = [ (isGe "8.13") ]; out = "1.0"; }
+    { cases = [ (range "8.13" "8.15") ]; out = "1.0"; }
   ] null;
 
   propagatedBuildInputs = [ coq-elpi ];