diff --git a/crypto/libcrypt_samsung/include/libcrypt_samsung.h b/crypto/libcrypt_samsung/include/libcrypt_samsung.h
index 48c7b3e..2fb6f2c 100644
--- a/crypto/libcrypt_samsung/include/libcrypt_samsung.h
+++ b/crypto/libcrypt_samsung/include/libcrypt_samsung.h
@@ -133,6 +133,9 @@
 int unmount_ecryptfs_drive(
         const char *source);
 
+typedef int (*unmount_ecryptfs_drive_t)(
+        const char *source);
+
 //////////////////////////////////////////////////////////////////////////////
 
 #endif // #ifndef __LIBCRYPT_SAMSUNG_H__