diff --git a/pkgs/build-support/cc-wrapper/setup-hook.sh b/pkgs/build-support/cc-wrapper/setup-hook.sh
index cd98f57ee93..e23d7f4cf12 100644
--- a/pkgs/build-support/cc-wrapper/setup-hook.sh
+++ b/pkgs/build-support/cc-wrapper/setup-hook.sh
@@ -34,5 +34,10 @@ if [ -n "@coreutils@" ]; then
     addToSearchPath PATH @coreutils@/bin
 fi
 
-export CC=@real_cc@
-export CXX=@real_cxx@
+if [ -z "$crossConfig" ]; then
+    export CC=@real_cc@
+    export CXX=@real_cxx@
+else
+    export BUILD_CC=@real_cc@
+    export BUILD_CXX=@real_cxx@
+fi
diff --git a/pkgs/build-support/gcc-cross-wrapper/setup-hook.sh b/pkgs/build-support/gcc-cross-wrapper/setup-hook.sh
index ce5f6e56136..599954bd127 100644
--- a/pkgs/build-support/gcc-cross-wrapper/setup-hook.sh
+++ b/pkgs/build-support/gcc-cross-wrapper/setup-hook.sh
@@ -85,3 +85,6 @@ if test "$NIX_NO_SELF_RPATH" != "1"; then
         export NIX_CROSS_LDFLAGS="-rpath $out/lib64 -rpath-link $out/lib $NIX_CROSS_LDFLAGS"
     fi
 fi
+
+export CC=${crossConfig}-gcc
+export CXX=${crossConfig}-g++