diff --git a/srcpkgs/boost/patches/unorder-fix-copy-assign.patch b/srcpkgs/boost/patches/unorder-fix-copy-assign.patch
new file mode 100644
index 00000000000..11e8728e92b
--- /dev/null
+++ b/srcpkgs/boost/patches/unorder-fix-copy-assign.patch
@@ -0,0 +1,16 @@
+diff --git a/include/boost/unordered/detail/foa/core.hpp b/include/boost/unordered/detail/foa/core.hpp
+index 239d05d3..7ae9f2c8 100644
+--- a/boost/unordered/detail/foa/core.hpp
++++ b/boost/unordered/detail/foa/core.hpp
+@@ -1870,9 +1870,10 @@ private:
+ 
+   void fast_copy_elements_from(const table_core& x)
+   {
+-    if(arrays.elements){
++    if(arrays.elements&&x.arrays.elements){
+       copy_elements_array_from(x);
+       copy_groups_array_from(x);
++      size_ctrl.ml=std::size_t(x.size_ctrl.ml);
+       size_ctrl.size=std::size_t(x.size_ctrl.size);
+     }
+   }
diff --git a/srcpkgs/boost/template b/srcpkgs/boost/template
index d4ca6cfd739..c270d80f5c2 100644
--- a/srcpkgs/boost/template
+++ b/srcpkgs/boost/template
@@ -1,7 +1,7 @@
 # Template file for 'boost'
 pkgname=boost
 version=1.83.0
-revision=1
+revision=2
 build_style=meta
 hostmakedepends="which bzip2-devel icu-devel python3-devel pkg-config openmpi"
 makedepends="zlib-devel bzip2-devel icu-devel python3-devel liblzma-devel