diff --git a/src/os/unix/ngx_files.c b/src/os/unix/ngx_files.c
index 482d32763..7e8e58fe7 100644
--- a/src/os/unix/ngx_files.c
+++ b/src/os/unix/ngx_files.c
@@ -875,6 +875,12 @@ ngx_fs_bsize(u_char *name)
         return 512;
     }
 
+#if (NGX_LINUX)
+    if ((size_t) fs.f_bsize > ngx_pagesize) {
+        return 512;
+    }
+#endif
+
     return (size_t) fs.f_bsize;
 }
 
@@ -893,6 +899,12 @@ ngx_fs_bsize(u_char *name)
         return 512;
     }
 
+#if (NGX_LINUX)
+    if ((size_t) fs.f_frsize > ngx_pagesize) {
+        return 512;
+    }
+#endif
+
     return (size_t) fs.f_frsize;
 }