diff --git a/gnu/packages/version-control.scm b/gnu/packages/version-control.scm
index bc4242fc107fb98250b97467dac2f97ef683ed8d..9667b2f3ec97ad41cf0cd2a6b93b04a972f2ab17 100644
--- a/gnu/packages/version-control.scm
+++ b/gnu/packages/version-control.scm
@@ -347,7 +347,8 @@ (define-public libgit2
     (build-system cmake-build-system)
     (outputs '("out" "debug"))
     (arguments
-     `(#:phases
+     `(#:configure-flags '("-DUSE_SHA1DC=ON") ; SHA-1 collision detection
+       #:phases
        (modify-phases %standard-phases
          (add-after 'unpack 'fix-hardcoded-paths
            (lambda _