diff --git a/src/editline.c b/src/editline.c
index 9aa8e10..30f64f1 100644
--- a/src/editline.c
+++ b/src/editline.c
@@ -1933,12 +1933,12 @@ static el_status_t el_bind_key_in_map(int key, el_keymap_func_t function, el_key
 
 el_status_t el_bind_key(int key, el_keymap_func_t function)
 {
-    return el_bind_key_in_map(key, function, Map, ARRAY_ELEMENTS(Map));
+    return el_bind_key_in_map(key, function, Map, NELEMS(Map));
 }
 
 el_status_t el_bind_key_in_metamap(int key, el_keymap_func_t function)
 {
-    return el_bind_key_in_map(key, function, MetaMap, ARRAY_ELEMENTS(MetaMap));
+    return el_bind_key_in_map(key, function, MetaMap, NELEMS(MetaMap));
 }
 
 /**
diff --git a/src/editline.h b/src/editline.h
index d41eddf..d11b6e6 100644
--- a/src/editline.h
+++ b/src/editline.h
@@ -57,8 +57,10 @@
 #define MEM_INC         64
 #define SCREEN_INC      256
 
-/* http://stackoverflow.com/questions/1598773/is-there-a-standard-function-in-c-that-would-return-the-length-of-an-array/1598827#1598827 */
-#define ARRAY_ELEMENTS(arr) ((sizeof(arr)/sizeof(0[arr])) / ((size_t)(!(sizeof(arr) % sizeof(0[arr])))))
+/* From The Practice of Programming, by Kernighan and Pike */
+#ifndef NELEMS
+#define NELEMS(array) (sizeof(array) / sizeof(array[0]))
+#endif
 
 /*
 **  Variables and routines internal to this package.