diff --git a/02_macros/vec.inc b/02_macros/vec.inc
index 6427f05..da9c66a 100644
--- a/02_macros/vec.inc
+++ b/02_macros/vec.inc
@@ -1,14 +1,9 @@
 #include "../aliases.h"
+#include "../helper_macros.h"
 #include <stdio.h>
 #include <math.h>
 
-#define obj(o, m) o.m
-#define stringify(x) #x
 #define printf_spec(PI) stringify(PI)
-#define typename_concat(C, I) vec##C##I##_t
-#define typename(C, I) typename_concat(C, I)
-#define funcname_concat(B, C, I) vec_##B##_vec##C##I##_t
-#define funcname(B, C, I) funcname_concat(B, C, I)
 
 typedef struct {
 	T x;
diff --git a/03_xmacros/vec.inc b/03_xmacros/vec.inc
index 48f842e..ffa397d 100644
--- a/03_xmacros/vec.inc
+++ b/03_xmacros/vec.inc
@@ -1,14 +1,10 @@
 #include "../aliases.h"
+#include "../helper_macros.h"
 #include <stdio.h>
 #include <math.h>
 
 #define obj(o, m) o.m
-#define stringify(x) #x
 #define printf_spec(PI) "%" stringify(PI) ", "
-#define typename_concat(C, I) vec##C##I##_t
-#define typename(C, I) typename_concat(C, I)
-#define funcname_concat(B, C, I) vec_##B##_vec##C##I##_t
-#define funcname(B, C, I) funcname_concat(B, C, I)
 
 typedef struct {
 	#define VEC(type, name) type name;
diff --git a/helper_macros.h b/helper_macros.h
new file mode 100644
index 0000000..494475e
--- /dev/null
+++ b/helper_macros.h
@@ -0,0 +1,10 @@
+#ifndef HELPER_MACROS_H
+#define HELPER_MACROS_H
+
+#define stringify(x) #x
+#define typename_concat(C, I) vec##C##I##_t
+#define typename(C, I) typename_concat(C, I)
+#define funcname_concat(B, C, I) vec_##B##_vec##C##I##_t
+#define funcname(B, C, I) funcname_concat(B, C, I)
+
+#endif // !HELPER_MACROS_H