diff --git a/prepare-opam.sh b/prepare-opam.sh
index 6d2c4efc27b195a3ca1640bea15ac5dbb34944e3..7b061649c78c7387da167ffa5c135f69a4ca36b9 100644
--- a/prepare-opam.sh
+++ b/prepare-opam.sh
@@ -70,7 +70,7 @@ fi
 
 # Install build-dependencies.
 echo_color "$BOLDGREEN" "[prepare-opam] Installing build-dependencies"
-make build-dep OPAMFLAGS="-y --use-internal-solver"
+make build-dep OPAMFLAGS="-y"
 echo
 
 # done