diff --git a/sample/c++/LennardJones/Makefile b/sample/c++/LennardJones/Makefile
index 1a95d41..08e6f70 100644
--- a/sample/c++/LennardJones/Makefile
+++ b/sample/c++/LennardJones/Makefile
@@ -1,11 +1,12 @@
 CC=g++
 CCFLAGS= -O2 
-CCFLAGS += -I../../inc
 
-PIKG_ROOT=../../
+PIKG_ROOT=../../../
 PIKG=$(PIKG_ROOT)/bin/pikg
 CONVERSION_TYPE=reference
 
+CCFLAGS += -I$(PIKG_ROOT)/inc
+
 PIKG_OPTION= --conversion-type $(CONVERSION_TYPE) --epi-name EP --epj-name EP --force-name Force
 # AVX2 mode
 #CONVERSION_TYPE=AVX2 
diff --git a/sample/c++/Nbody/Makefile b/sample/c++/Nbody/Makefile
index a8e6d19..4fc0584 100644
--- a/sample/c++/Nbody/Makefile
+++ b/sample/c++/Nbody/Makefile
@@ -1,10 +1,10 @@
 CC=g++
 CCFLAGS= -O2 
 
-PIKG_ROOT=../../
+PIKG_ROOT=../../../
 PIKG=$(PIKG_ROOT)/bin/pikg
 CONVERSION_TYPE=reference
-CCFLAGS += -I../../inc
+CCFLAGS += -I$(PIKG_ROOT)/inc
 
 PIKG_OPTION= --conversion-type $(CONVERSION_TYPE) --epi-name Particle --epj-name Particle --force-name Particle