diff --git a/pkgs/os-specific/linux/busybox/default.nix b/pkgs/os-specific/linux/busybox/default.nix
index 92f24b9e9ae..296b19bc5b6 100644
--- a/pkgs/os-specific/linux/busybox/default.nix
+++ b/pkgs/os-specific/linux/busybox/default.nix
@@ -64,7 +64,11 @@ stdenv.mkDerivation rec {
     EOF
 
     make oldconfig
-  '' + lib.optionalString useMusl ''
+
+    runHook postConfigure
+  '';
+
+  postConfigure = lib.optionalString useMusl ''
     makeFlagsArray+=("CC=gcc -isystem ${musl}/include -B${musl}/lib -L${musl}/lib")
   '';
 
@@ -73,10 +77,11 @@ stdenv.mkDerivation rec {
   crossAttrs = {
     extraCrossConfig = ''
       CONFIG_CROSS_COMPILER_PREFIX "${stdenv.cross.config}-"
-    '' +
-      (if stdenv.cross.platform.kernelMajor == "2.4" then ''
-        CONFIG_IONICE n
-      '' else "");
+    '';
+
+    postConfigure = stdenv.lib.optionalString useMusl ''
+      makeFlagsArray+=("CC=$crossConfig-gcc -isystem ${musl.crossDrv}/include -B${musl.crossDrv}/lib -L${musl.crossDrv}/lib")
+    '';
   };
 
   enableParallelBuilding = true;