diff --git a/media-libs/lib3mf/files/lib3mf-2.2.0-include-cstdint.patch b/media-libs/lib3mf/files/lib3mf-2.2.0-include-cstdint.patch
new file mode 100644
index 0000000000000..36776fd027514
--- /dev/null
+++ b/media-libs/lib3mf/files/lib3mf-2.2.0-include-cstdint.patch
@@ -0,0 +1,13 @@
+diff --git a/Source/Common/Platform/NMR_ImportStream_Unique_Memory.cpp b/Source/Common/Platform/NMR_ImportStream_Unique_Memory.cpp
+index 43fd428..e966aa0 100644
+--- a/Source/Common/Platform/NMR_ImportStream_Unique_Memory.cpp
++++ b/Source/Common/Platform/NMR_ImportStream_Unique_Memory.cpp
+@@ -35,6 +35,8 @@ This is a platform independent class for keeping data in a memory stream that ow
+ #include "Common/NMR_Exception.h"
+ #include "Common/NMR_Exception_Windows.h"
+ 
++#include <cstdint>
++
+ namespace NMR {
+ 
+ 	CImportStream_Unique_Memory::CImportStream_Unique_Memory()
diff --git a/media-libs/lib3mf/lib3mf-2.2.0.ebuild b/media-libs/lib3mf/lib3mf-2.2.0.ebuild
index 97ec4b4b71463..d5d470010791d 100644
--- a/media-libs/lib3mf/lib3mf-2.2.0.ebuild
+++ b/media-libs/lib3mf/lib3mf-2.2.0.ebuild
@@ -36,6 +36,7 @@ PATCHES=(
 	"${FILESDIR}"/${P}-0001-use-system-provided-act-binary.patch
 	"${FILESDIR}"/${P}-0002-Gentoo-specific-remove-add_dependencies.patch
 	"${FILESDIR}"/${P}-0001-remove-std-and-opt-flags.patch
+	"${FILESDIR}"/${P}-include-cstdint.patch
 )
 
 src_configure() {