diff --git a/lib/pinc_format/Formatter.ml b/lib/pinc_format/Formatter.ml
index 3a5954e..939ca7a 100644
--- a/lib/pinc_format/Formatter.ml
+++ b/lib/pinc_format/Formatter.ml
@@ -266,7 +266,7 @@ and format_binary_expression left op right =
   | Parsetree.Operators.Binary.BRACKET_ACCESS -> l ^^ brackets r
   | Parsetree.Operators.Binary.FUNCTION_CALL -> l ^^ parens r
   | Parsetree.Operators.Binary.PIPE -> l ^^ space ^^ bar ^^ rangle ^^ space ^^ r
-  | Parsetree.Operators.Binary.ARRAY_ADD -> l ^^ space ^^ at ^^ space ^^ r
+  | Parsetree.Operators.Binary.ARRAY_ADD -> l ^^ space ^^ langle ^^ minus ^^ space ^^ r
   | Parsetree.Operators.Binary.MERGE -> l ^^ space ^^ twice at ^^ space ^^ r
   | Parsetree.Operators.Binary.RANGE -> l ^^ twice dot ^^ r
   | Parsetree.Operators.Binary.INCLUSIVE_RANGE -> l ^^ repeat 3 dot ^^ r
diff --git a/test/array/run.t b/test/array/run.t
index 9904718..8068da4 100644
--- a/test/array/run.t
+++ b/test/array/run.t
@@ -48,8 +48,8 @@
     use Base;
   
     let array = 0...3;
-    let new_array = array @ 4;
-    let new_array_2 = array @ 4 @ 5 @ 6;
+    let new_array = array <- 4;
+    let new_array_2 = array <- 4 <- 5 <- 6;
   
     let merged_array = new_array @@ 5...7;
     let merged_array_2 = new_array @@ 5...7 @@ [8, 9];
@@ -69,7 +69,7 @@
       y: 8,
     };
   
-    let nested_array = new_array @ (merged_array @ merged_record_2);
+    let nested_array = new_array <- (merged_array <- merged_record_2);
     let index = 8;
   
     let partitioned = merged_array_2 |> Array.partition(fn (item) -> { item % 2 == 0 });