diff --git a/sci-mathematics/polymake/files/polymake-4.13-cstdint.patch b/sci-mathematics/polymake/files/polymake-4.13-cstdint.patch
new file mode 100644
index 0000000000000..a5734cdbf9adf
--- /dev/null
+++ b/sci-mathematics/polymake/files/polymake-4.13-cstdint.patch
@@ -0,0 +1,13 @@
+diff --git a/lib/core/include/internal/comparators.h b/lib/core/include/internal/comparators.h
+index 57e3f14..3486f80 100644
+--- a/lib/core/include/internal/comparators.h
++++ b/lib/core/include/internal/comparators.h
+@@ -17,6 +17,8 @@
+ 
+ #pragma once
+ 
++#include <cstdint>
++
+ #include "polymake/internal/comparators_ops.h"
+ #include "polymake/internal/matrix_rows_cols.h"
+ #include "polymake/TransformedContainer.h"
diff --git a/sci-mathematics/polymake/polymake-4.13.ebuild b/sci-mathematics/polymake/polymake-4.13.ebuild
index dd44fe5295b63..e7f06938aa0ec 100644
--- a/sci-mathematics/polymake/polymake-4.13.ebuild
+++ b/sci-mathematics/polymake/polymake-4.13.ebuild
@@ -53,6 +53,8 @@ RDEPEND="${DEPEND}
 	dev-perl/XML-SAX
 	dev-perl/XML-Writer"
 
+PATCHES=( "${FILESDIR}/${P}-cstdint.patch" )
+
 src_configure() {
 	# Without this, the build system tries to use "the highest possible"
 	# optimization level and will override what's in your CXXFLAGS.