diff --git a/tranlate_books/book-riscv-rev1/c1/s2.md b/tranlate_books/book-riscv-rev1/c1/s2.md
index fd3d09d..42a8d3a 100644
--- a/tranlate_books/book-riscv-rev1/c1/s2.md
+++ b/tranlate_books/book-riscv-rev1/c1/s2.md
@@ -17,7 +17,7 @@ for (;;) {
     n = read(0, buf, sizeof buf);
     if (n == 0)
         break;
-    if (n < 0) {
+    if (n < 0) {
         fprintf(2, "read error\n");
         exit(1);
     }