diff --git a/latexmkrc b/latexmkrc
index 584ddd9e..420b9899 100644
--- a/latexmkrc
+++ b/latexmkrc
@@ -14,4 +14,5 @@ $pdf_previewer = 'zathura';
 $pdflatex = 'pdflatex --shell-escape -interaction=nonstopmode';
 $latex = 'latex --shell-escape -interaction=nonstopmode';
 
-$ENV{'TEXMFHOME'}='./texmf-local:' . $ENV{'TEXMFHOME'};
+$old_texmfhome = exists $ENV{'TEXMFHOME'} ? (':' . $ENV{'TEXMFHOME'}) : '';
+$ENV{'TEXMFHOME'}='./texmf-local:' . $old_texmfhome;