diff --git a/external/patch-omptl b/external/patch-omptl
index f9b2e6d..8d5887b 100644
--- a/external/patch-omptl
+++ b/external/patch-omptl
@@ -92,3 +92,15 @@ diff -ur omptl.orig/omptl_numeric_par.h omptl/omptl_numeric_par.h
  
  namespace omptl
  {
+diff -ur omptl.orig/omptl_algorithm_par.h omptl/omptl_algorithm_par.h
+--- omptl.orig/omptl_algorithm_par.h	2021-05-09 14:26:47.227632829 +0300
++++ omptl/omptl_algorithm_par.h	2021-05-09 14:27:02.815744567 +0300
+@@ -1700,7 +1700,7 @@
+ 
+ 	std::vector<char> pivot_used(pivots.size(), false); // can't be bool due to parallel write
+ 
+-	const unsigned max_depth = std::floor(std::tr1::log2(P));
++	const unsigned max_depth = unsigned(std::floor(std::tr1::log2(P)));
+ 	assert(1u << max_depth <= P);
+ 	for (unsigned i = 0; i < max_depth; ++i)
+ 	{