diff --git a/Ports/mpc/package.sh b/Ports/mpc/package.sh
index 6327109c29..c9a67d0f49 100755
--- a/Ports/mpc/package.sh
+++ b/Ports/mpc/package.sh
@@ -4,7 +4,7 @@ version=1.2.1
 useconfigure=true
 use_fresh_config_sub=true
 config_sub_path=build-aux/config.sub
-configopts=("--target=${SERENITY_ARCH}-pc-serenity" "--with-sysroot=/")
+configopts=("--target=${SERENITY_ARCH}-pc-serenity" "--with-sysroot=${SERENITY_INSTALL_ROOT}")
 files="https://ftpmirror.gnu.org/gnu/mpc/mpc-${version}.tar.gz mpc-${version}.tar.gz
 https://ftpmirror.gnu.org/gnu/mpc/mpc-${version}.tar.gz.sig mpc-${version}.tar.gz.sig
 https://ftpmirror.gnu.org/gnu/gnu-keyring.gpg gnu-keyring.gpg"