diff --git a/src/node_internals.h b/src/node_internals.h
index bfe4fced26..5ff6b63d21 100644
--- a/src/node_internals.h
+++ b/src/node_internals.h
@@ -109,12 +109,6 @@ inline static int snprintf(char *buffer, size_t n, const char *format, ...) {
 #endif
 #endif
 
-#if defined(__x86_64__)
-# define BITS_PER_LONG 64
-#else
-# define BITS_PER_LONG 32
-#endif
-
 #ifndef ARRAY_SIZE
 # define ARRAY_SIZE(a) (sizeof((a)) / sizeof((a)[0]))
 #endif