diff --git a/stb.h b/stb.h
index 2d9dab6..15ecf51 100644
--- a/stb.h
+++ b/stb.h
@@ -3062,7 +3062,7 @@ typedef struct
 #define stb_arr_insertn(a,i,n) (stb__arr_insertn((void **) &(a), sizeof(*a), i, n))
 
 // insert an element at i
-#define stb_arr_insert(a,i,v)  (stb__arr_insertn((void **) &(a), sizeof(*a), i, n), ((a)[i] = v))
+#define stb_arr_insert(a,i,v)  (stb__arr_insertn((void **) &(a), sizeof(*a), i, 1), ((a)[i] = v))
 
 // delete N elements from the middle starting at index 'i'
 #define stb_arr_deleten(a,i,n) (stb__arr_deleten((void **) &(a), sizeof(*a), i, n))