diff --git a/tribes/packages/mix.scm b/tribes/packages/mix.scm
index c3799b6..575abdf 100644
--- a/tribes/packages/mix.scm
+++ b/tribes/packages/mix.scm
@@ -227,6 +227,7 @@ MIX-FOD-DEPS as a pre-fetched dependency tree."
               (setenv "MIX_ENV" #$mix-env)
               (setenv "MIX_TARGET" #$mix-target)
               (setenv "MIX_OS_CONCURRENCY_LOCK" "0")
+              (setenv "MIX_OS_DEPS_COMPILE_PARTITION_COUNT" "4")
               (setenv "HEX_OFFLINE" "1")
               (setenv "MIX_REBAR" #$(file-append rebar3 "/bin/rebar3"))
               (setenv "MIX_REBAR3" #$(file-append rebar3 "/bin/rebar3"))