diff --git a/src/check_expr.cpp b/src/check_expr.cpp
index 5a95a5dbb..4709691c5 100644
--- a/src/check_expr.cpp
+++ b/src/check_expr.cpp
@@ -5363,7 +5363,8 @@ gb_internal bool check_index_value(CheckerContext *c, Type *main_type, bool open
 					TEMPORARY_ALLOCATOR_GUARD();
 					String idx_str = big_int_to_string(temporary_allocator(), &i);
 					gbString expr_str = expr_to_string(operand.expr, temporary_allocator());
-					error(operand.expr, "Index '%s' is out of bounds range 0..<%lld, got %.*s", expr_str, max_count, LIT(idx_str));
+					char range_type = open_range ? '=' : '<';
+					error(operand.expr, "Index '%s' is out of bounds range 0..%c%lld, got %.*s", expr_str, range_type, max_count, LIT(idx_str));
 					return false;
 				}