diff --git a/.gitignore b/.gitignore
index 94f60ddf5..19dfac9ef 100644
--- a/.gitignore
+++ b/.gitignore
@@ -37,3 +37,5 @@ lapack/reference
 Makefile
 !ci/build.gitlab-ci.yml
 !scripts/buildtests.in
+!Eigen/Core
+!Eigen/src/Core