diff --git a/demo/Makefile b/demo/Makefile
index 2c1fb20dc02fcdd981287a41d26f09498b3608f2..40f340aa3acea74bada4081ab8dbe88e2858073d 100644
--- a/demo/Makefile
+++ b/demo/Makefile
@@ -39,7 +39,7 @@ PARMETIS_DIR = $(AMDIS_DIR)/lib/ParMetis-3.1
 # ===== includes pathes ======================================================
 # ============================================================================
 
-AMDIS_INCLUDE = -I$(AMDIS_DIR)/src
+AMDIS_INCLUDE = -I$(AMDIS_DIR)/src -I$(AMDIS_DIR)/lib/mtl4
 SMI_INCLUDE = -I$(SMI_DIR)/smi 
 MPCCI_INCLUDE = -I$(MPCCI_DIR)/include
 PARMETIS_INCLUDE = -I$(PARMETIS_DIR)