diff --git a/src/alg_utils.jl b/src/alg_utils.jl
index fb5cf3096a..a44774ddbe 100644
--- a/src/alg_utils.jl
+++ b/src/alg_utils.jl
@@ -492,7 +492,7 @@ alg_order(alg::DPRKN12) = 12
 alg_order(alg::ERKN4) = 4
 alg_order(alg::ERKN5) = 5
 alg_order(alg::ERKN7) = 7
-alg_order(alg::RKN4) = 3
+alg_order(alg::RKN4) = 4
 
 alg_order(alg::Midpoint) = 2