diff --git a/gnu/packages/version-control.scm b/gnu/packages/version-control.scm
index fbaf8f2f29cf9a75cd894eca92989f111386f815..bc4242fc107fb98250b97467dac2f97ef683ed8d 100644
--- a/gnu/packages/version-control.scm
+++ b/gnu/packages/version-control.scm
@@ -345,6 +345,7 @@ (define-public libgit2
                 "1fdk9yhwvl1w1z71ykzcvgh4nsf8scxcbclz5anh98zpplmhmisa"))
               (patches (search-patches "libgit2-0.25.1-mtime-0.patch"))))
     (build-system cmake-build-system)
+    (outputs '("out" "debug"))
     (arguments
      `(#:phases
        (modify-phases %standard-phases