diff --git a/Makefile b/Makefile
index 8e7e82711a1ee45ba1a190be27c59bddd23217e4..0355d12b6c1b3fc2fb313ad183fe65cdcc0f4830 100644
--- a/Makefile
+++ b/Makefile
@@ -11,6 +11,7 @@ SUBDIR+=	certi
 SUBDIR+=	cppad
 SUBDIR+=	cppadcodegen
 SUBDIR+=	dptu-genom3
+SUBDIR+=	ddp-actuator-solver
 SUBDIR+=	dynamic-graph-tutorial
 SUBDIR+=	dynamic-graph-v3
 SUBDIR+=	dynamic-introspection