diff --git a/gnu/packages/bioinformatics.scm b/gnu/packages/bioinformatics.scm
index 05febb31ce..51179d602d 100644
--- a/gnu/packages/bioinformatics.scm
+++ b/gnu/packages/bioinformatics.scm
@@ -14974,7 +14974,7 @@ (define-public perl-cworld-dekker
                                 (string-append ":" out
                                                "/lib/perl5/site_perl"))
                            pl)
-                 (for-each (cut wrap <> "PYTHONPATH") py))))))))
+                 (for-each (cut wrap <> "GUIX_PYTHONPATH") py))))))))
     (inputs
      `(("libgd" ,gd)
        ("perl-gd" ,perl-gd)