diff --git a/src/system/kernel/fs/vfs.cpp b/src/system/kernel/fs/vfs.cpp
index 4ac9022711..7ac6152b1c 100644
--- a/src/system/kernel/fs/vfs.cpp
+++ b/src/system/kernel/fs/vfs.cpp
@@ -26,6 +26,7 @@
 #include <fs_info.h>
 #include <fs_interface.h>
 #include <fs_volume.h>
+#include <NodeMonitor.h>
 #include <OS.h>
 #include <StorageDefs.h>
 
@@ -6606,8 +6607,10 @@ common_write_stat(struct file_descriptor* descriptor, const struct stat* stat,
 	FUNCTION(("common_write_stat(vnode = %p, stat = %p, statMask = %d)\n",
 		vnode, stat, statMask));
 
-	if ((descriptor->open_mode & O_RWMASK) == O_RDONLY)
+	if ((descriptor->open_mode & O_RWMASK) == O_RDONLY
+		&& (statMask & B_STAT_SIZE) != 0) {
 		return B_BAD_VALUE;
+	}
 
 	if (!HAS_FS_CALL(vnode, write_stat))
 		return B_READ_ONLY_DEVICE;
diff --git a/src/tests/system/libroot/posix/Jamfile b/src/tests/system/libroot/posix/Jamfile
index 187dcb050f..054b4f694f 100644
--- a/src/tests/system/libroot/posix/Jamfile
+++ b/src/tests/system/libroot/posix/Jamfile
@@ -11,6 +11,7 @@ SimpleTest abort_test : abort_test.cpp ;
 SimpleTest SyslogTest : SyslogTest.cpp ;
 SimpleTest brk_test : brk_test.c ;
 SimpleTest calloc_test : calloc_test.c ;
+SimpleTest <test>chmod : chmod.cpp ;
 SimpleTest clearenv : clearenv.cpp ;
 SimpleTest dirent_test : dirent_test.cpp ;
 SimpleTest flock_test : flock_test.cpp ;
diff --git a/src/tests/system/libroot/posix/chmod.cpp b/src/tests/system/libroot/posix/chmod.cpp
new file mode 100644
index 0000000000..bdd4317551
--- /dev/null
+++ b/src/tests/system/libroot/posix/chmod.cpp
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2008, Axel Dörfler, axeld@pinc-software.de.
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+
+extern const char *__progname;
+
+
+int
+main(int argc, char **argv)
+{
+	if (argc < 3) {
+		fprintf(stderr, "usage: %s <file> <size>\n", __progname);
+		return 1;
+	}
+
+	struct stat st;
+	if (stat(argv[1], &st) != 0) {
+		fprintf(stderr, "%s: cannot stat file \"%s\": %s\n", __progname,
+			argv[1], strerror(errno));
+		return 1;
+	}
+
+	int fd = open(argv[1], O_RDONLY);
+	if (fd < 0) {
+		fprintf(stderr, "%s: could open the file read-only \"%s\": %s\n",
+			__progname, argv[1], strerror(errno));
+		return 1;
+	}
+	if (fchmod(fd, 0666) == -1) {
+		fprintf(stderr, "%s: couldn't chmod a file opened read-only \"%s\": %s\n",
+			__progname, argv[1], strerror(errno));
+		close(fd);
+		return 1;
+	}
+	close(fd);
+
+	return 0;
+}