diff --git a/router/router.cpp b/router/router.cpp
index 82ed9b6d056d420c09db94132e0bbcfbbe8be9dc..a1f46399906b44e58fabd65cdaadb9d9ef5d9358 100644
--- a/router/router.cpp
+++ b/router/router.cpp
@@ -90,7 +90,7 @@ int router(short int size_x, short int size_y, short int line_num, short int boa
 	cout << "rip-up routing ..." << endl;
 	short int last_target = -1;
 	ap_uint<16> round;
-	for(round = 1; round <= ROUND_END; round++) {
+	for(round = 1; round <= ROUND_LIMIT; round++) {
 		short int target = lfsr_random() % line_num;
 		if(adjacents[target]) continue;
 		if(target == last_target) continue;
diff --git a/router/router.hpp b/router/router.hpp
index 718e0482c4f46ad04366db9467cdabdcebf6b43d..0adcbb7b7a5b3eaf40fc232b3d0164e50755506e 100644
--- a/router/router.hpp
+++ b/router/router.hpp
@@ -11,7 +11,7 @@
 
 using namespace std;
 
-#define ROUND_END 32768 // Max=65534(=2^16-2)
+#define ROUND_LIMIT 32768 // Max=65534(=2^16-2)
 #define PRINT_BOARD
 //#define PRINT_SEARCH // for router debug