diff --git a/contrib/guix/libexec/build.sh b/contrib/guix/libexec/build.sh
index 6741328473d..9351c542296 100755
--- a/contrib/guix/libexec/build.sh
+++ b/contrib/guix/libexec/build.sh
@@ -214,6 +214,7 @@ make -C depends --jobs="$JOBS" HOST="$HOST" \
                                    x86_64_linux_NM=x86_64-linux-gnu-nm \
                                    x86_64_linux_STRIP=x86_64-linux-gnu-strip \
                                    qt_config_opts_i686_linux='-platform linux-g++ -xplatform bitcoin-linux-g++' \
+                                   qt_config_opts_x86_64_linux='-platform linux-g++ -xplatform bitcoin-linux-g++' \
                                    FORCE_USE_SYSTEM_CLANG=1