diff --git a/osfs/os_posix.go b/osfs/os_posix.go
index 144cde1..021ca7d 100644
--- a/osfs/os_posix.go
+++ b/osfs/os_posix.go
@@ -1,4 +1,4 @@
-// +build !windows
+// +build !windows,!solaris
 
 package osfs
 
diff --git a/osfs/os_solaris.go b/osfs/os_solaris.go
new file mode 100644
index 0000000..8e2c21e
--- /dev/null
+++ b/osfs/os_solaris.go
@@ -0,0 +1,19 @@
+// +build solaris
+
+package osfs
+
+import "syscall"
+
+func (f *file) Lock() error {
+	f.m.Lock()
+	defer f.m.Unlock()
+
+	return syscall.Flock(int(f.File.Fd()), syscall.LOCK_EX)
+}
+
+func (f *file) Unlock() error {
+	f.m.Lock()
+	defer f.m.Unlock()
+
+	return syscall.Flock(int(f.File.Fd()), syscall.LOCK_UN)
+}