diff --git a/ocaml-camomile.spec b/ocaml-camomile.spec
index a1e4b3f..442aaa3 100644
--- a/ocaml-camomile.spec
+++ b/ocaml-camomile.spec
@@ -55,6 +55,11 @@ applications that use %{name}.
 
 
 %build
+# This avoids a stack overflow in the OCaml 4.05 compiler on POWER only.
+%ifarch %{power64}
+ulimit -Hs 65536
+ulimit -Ss 65536
+%endif
 jbuilder build --verbose