diff --git a/tests/src/test_cases/test_fs.c b/tests/src/test_cases/test_fs.c
index 0e3419550f..24493292e3 100644
--- a/tests/src/test_cases/test_fs.c
+++ b/tests/src/test_cases/test_fs.c
@@ -32,7 +32,7 @@ void test_read(void)
     char cur[512];
     getcwd(cur, 512);
     errno = 0;
-    void * a = fopen("src/test_files/readtest.txt", "rd");
+    void * a = fopen("src/test_files/readtest.txt", "r");
     printf("%s, %d, %p\n", cur, errno, a);
     fclose(a);