diff --git a/pkg-deps.sh b/pkg-deps.sh
index aa2ba04..e581bf4 100755
--- a/pkg-deps.sh
+++ b/pkg-deps.sh
@@ -29,4 +29,6 @@ for i in $GHC_PKGS; do sed -i -e /$i/d pkgs.dot; done
 
 cat pkgs.dot | tred | dot -Nfontsize=8 -Tsvg >pkgs.svg
 
-xdg-open pkgs.svg
+if [ -n "$DISPLAY"]; then
+  xdg-open pkgs.svg
+fi