diff --git a/src/headers/vector2d.h b/src/headers/vector2d.h
index d7741ae..67802a4 100644
--- a/src/headers/vector2d.h
+++ b/src/headers/vector2d.h
@@ -42,9 +42,9 @@ typedef SDL_FRect frect_t;
 
 #define EPSILON 0.000001f
 
-#define is_equal_to_zero(X) (fabsf(X) <= EPSILON)
+#define f_is_zero(X) (fabsf(X) <= EPSILON)
 
-#define is_not_zero(X) (fabsf(X) > EPSILON)
+#define f_is_not_zero(X) (fabsf(X) > EPSILON)
 
 void rect_to_frect(const rect_t *rect, frect_t *frect);