diff --git a/biner.y b/biner.y
index daa95af..abc20c2 100644
--- a/biner.y
+++ b/biner.y
@@ -103,8 +103,8 @@ resolve_constant_(
 %type <ptr> struct_member_type array_struct_member_type unqualified_struct_member_type
 
 %type <ptr> expr or_expr and_expr bit_or_expr bit_xor_expr
-%type <ptr> bit_and_expr equality_expr relational_expr add_expr
-%type <ptr> mul_expr unary_expr operand
+%type <ptr> bit_and_expr equality_expr relational_expr shift_expr
+%type <ptr> add_expr mul_expr unary_expr operand
 
 %start decl_list
 
@@ -314,7 +314,7 @@ equality_expr
   ;
 
 relational_expr
-  : add_expr
+  : shift_expr
   | relational_expr '>' add_expr {
     $$ = create_operator_($1, BINER_TREE_EXPR_TYPE_OPERATOR_GREATER, $3);
   }
@@ -329,6 +329,16 @@ relational_expr
   }
   ;
 
+shift_expr
+  : add_expr
+  | shift_expr BIT_LSHIFT add_expr {
+    $$ = create_operator_($1, BINER_TREE_EXPR_TYPE_OPERATOR_BIT_LSHIFT, $3);
+  }
+  | shift_expr BIT_RSHIFT add_expr {
+    $$ = create_operator_($1, BINER_TREE_EXPR_TYPE_OPERATOR_BIT_RSHIFT, $3);
+  }
+  ;
+
 add_expr
   : mul_expr
   | add_expr '+' mul_expr {
diff --git a/test/user.biner b/test/user.biner
index dd8e9d8..7d59467 100644
--- a/test/user.biner
+++ b/test/user.biner
@@ -29,8 +29,8 @@ struct teacher_t {
 };
 
 struct student_t {
-  lu8[10] scores;
-  lu8     absents;
+  lu8[(1 << 4) - 6] scores;
+  lu8 absents;
 };
 
 struct user_t {
diff --git a/transpile_c.c b/transpile_c.c
index 95da95d..3a22d14 100644
--- a/transpile_c.c
+++ b/transpile_c.c
@@ -56,6 +56,8 @@ static const char* const expr_operator_string_map_
   [BINER_TREE_EXPR_TYPE_OPERATOR_BIT_OR]        = "|",
   [BINER_TREE_EXPR_TYPE_OPERATOR_BIT_NOT]       = "~",
   [BINER_TREE_EXPR_TYPE_OPERATOR_BIT_XOR]       = "^",
+  [BINER_TREE_EXPR_TYPE_OPERATOR_BIT_LSHIFT]    = "<<",
+  [BINER_TREE_EXPR_TYPE_OPERATOR_BIT_RSHIFT]    = ">>",
 };
 
 typedef struct struct_member_info_t {
diff --git a/tree.h b/tree.h
index 17e9ac7..3543a4f 100644
--- a/tree.h
+++ b/tree.h
@@ -36,6 +36,8 @@ typedef enum biner_tree_expr_type_t {
   BINER_TREE_EXPR_TYPE_OPERATOR_BIT_OR,
   BINER_TREE_EXPR_TYPE_OPERATOR_BIT_NOT,
   BINER_TREE_EXPR_TYPE_OPERATOR_BIT_XOR,
+  BINER_TREE_EXPR_TYPE_OPERATOR_BIT_LSHIFT,
+  BINER_TREE_EXPR_TYPE_OPERATOR_BIT_RSHIFT,
 
   BINER_TREE_EXPR_TYPE_OPERATOR_MAX_,
 } biner_tree_expr_type_t;