diff --git a/contrib/guix/guix-build b/contrib/guix/guix-build
index 31f95471..d7a78bbb 100755
--- a/contrib/guix/guix-build
+++ b/contrib/guix/guix-build
@@ -19,6 +19,15 @@ source "$(dirname "${BASH_SOURCE[0]}")/libexec/prelude.bash"
 
 check_tools cat mkdir make getent curl git guix
 
+################
+# Check if we're running as root
+################
+
+if [ "$EUID" -eq 0 ]; then
+  echo "Warning! Running this script as root may cause problems."
+  echo
+fi
+
 ################
 # GUIX_BUILD_OPTIONS should be empty
 ################