diff --git a/fs_functions.c b/fs_functions.c
index abf6f09..2526465 100644
--- a/fs_functions.c
+++ b/fs_functions.c
@@ -44,8 +44,8 @@ EXPORT_DECL(s32, FSRemove, void *pClient, void *pCmd, const char *path, s32 erro
 EXPORT_DECL(s32, FSRemoveAsync, void *pClient, void *pCmd, const char *path, s32 error, void *asyncParams);
 EXPORT_DECL(s32, FSFlushQuota, void *pClient, void *pCmd, const char* path, s32 error);
 EXPORT_DECL(s32, FSFlushQuotaAsync, void *pClient, void *pCmd, const char *path, s32 error, void *asyncParams);
-EXPORT_DECL(s32, FSGetFreeSpaceSize, void *pClient, void *pCmd, const char *path, uint64_t *returnedFreeSize, s32 error);
-EXPORT_DECL(s32, FSGetFreeSpaceSizeAsync, void *pClient, void *pCmd, const char *path, uint64_t *returnedFreeSize, s32 error, void *asyncParams);
+EXPORT_DECL(s32, FSGetFreeSpaceSize, void *pClient, void *pCmd, const char *path, u64 *returnedFreeSize, s32 error);
+EXPORT_DECL(s32, FSGetFreeSpaceSizeAsync, void *pClient, void *pCmd, const char *path, u64 *returnedFreeSize, s32 error, void *asyncParams);
 EXPORT_DECL(s32, FSRollbackQuota, void *pClient, void *pCmd, const char *path, s32 error);
 EXPORT_DECL(s32, FSRollbackQuotaAsync, void *pClient, void *pCmd, const char *path, s32 error, void *asyncParams);
 
diff --git a/fs_functions.h b/fs_functions.h
index 4fefb59..4728359 100644
--- a/fs_functions.h
+++ b/fs_functions.h
@@ -57,8 +57,8 @@ extern s32 (* FSRemove)(void *pClient, void *pCmd, const char *path, s32 error);
 extern s32 (* FSRemoveAsync)(void *pClient, void *pCmd, const char *path, s32 error, void *asyncParams);
 extern s32 (* FSFlushQuota)(void *pClient, void *pCmd, const char* path, s32 error);
 extern s32 (* FSFlushQuotaAsync)(void *pClient, void *pCmd, const char *path, s32 error, void *asyncParams);
-extern s32 (* FSGetFreeSpaceSize)(void *pClient, void *pCmd, const char *path, uint64_t *returnedFreeSize, s32 error);
-extern s32 (* FSGetFreeSpaceSizeAsync)(void *pClient, void *pCmd, const char *path, uint64_t *returnedFreeSize, s32 error, void *asyncParams);
+extern s32 (* FSGetFreeSpaceSize)(void *pClient, void *pCmd, const char *path, u64 *returnedFreeSize, s32 error);
+extern s32 (* FSGetFreeSpaceSizeAsync)(void *pClient, void *pCmd, const char *path, u64 *returnedFreeSize, s32 error, void *asyncParams);
 extern s32 (* FSRollbackQuota)(void *pClient, void *pCmd, const char *path, s32 error);
 extern s32 (* FSRollbackQuotaAsync)(void *pClient, void *pCmd, const char *path, s32 error, void *asyncParams);