diff --git a/builder/comp-builder.nix b/builder/comp-builder.nix
index b43e5d2b06..36b0fe1d09 100644
--- a/builder/comp-builder.nix
+++ b/builder/comp-builder.nix
@@ -454,17 +454,17 @@ let
       # See also https://gitlab.haskell.org/ghc/ghc/-/issues/12935
       (if contentAddressed then ''
         runHook preBuild
-        $SETUP_HS build ${haskellLib.componentTarget componentId} -j1 ${lib.concatStringsSep " " setupBuildFlags}
+        $SETUP_HS build ${haskellLib.componentTarget componentId} -j1 ${lib.concatStringsSep " " (component.setupBuildFlags ++ setupBuildFlags)}
         runHook postBuild
       '' else if stdenv.hostPlatform.isGhcjs then ''
         runHook preBuild
         # https://gitlab.haskell.org/ghc/ghc/issues/9221
-        $SETUP_HS build ${haskellLib.componentTarget componentId} ${lib.concatStringsSep " " setupBuildFlags}
+        $SETUP_HS build ${haskellLib.componentTarget componentId} ${lib.concatStringsSep " " (component.setupBuildFlags ++ setupBuildFlags)}
         runHook postBuild
       '' else ''
         runHook preBuild
         # https://gitlab.haskell.org/ghc/ghc/issues/9221
-        $SETUP_HS build ${haskellLib.componentTarget componentId} -j$(($NIX_BUILD_CORES > 4 ? 4 : $NIX_BUILD_CORES)) ${lib.concatStringsSep " " setupBuildFlags}
+        $SETUP_HS build ${haskellLib.componentTarget componentId} -j$(($NIX_BUILD_CORES > 4 ? 4 : $NIX_BUILD_CORES)) ${lib.concatStringsSep " " (component.setupBuildFlags ++ setupBuildFlags)}
         runHook postBuild
       '');