diff --git a/timsort.h b/timsort.h
index 383584fb..27e34520 100644
--- a/timsort.h
+++ b/timsort.h
@@ -169,7 +169,9 @@ typedef struct {
 } TIM_SORT_RUN_T;
 
 
+XML_HIDDEN
 void BINARY_INSERTION_SORT(SORT_TYPE *dst, const size_t size);
+XML_HIDDEN
 void TIM_SORT(SORT_TYPE *dst, const size_t size);