diff --git a/0001-Adapt-to-C-20-deleted-ostream-for-sal_Unicode-aka-ch.patch b/0001-Adapt-to-C-20-deleted-ostream-for-sal_Unicode-aka-ch.patch
new file mode 100644
index 0000000..6bb4b90
--- /dev/null
+++ b/0001-Adapt-to-C-20-deleted-ostream-for-sal_Unicode-aka-ch.patch
@@ -0,0 +1,52 @@
+From e8cb5f2e11838060f85e7940540b5f7096d9eeb7 Mon Sep 17 00:00:00 2001
+From: Stephan Bergmann <sbergman@redhat.com>
+Date: Tue, 3 Dec 2019 13:30:41 +0100
+Subject: [PATCH] Adapt to C++20 deleted ostream << for sal_Unicode (aka
+ char16_t)
+
+<http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1423r3.html> "char8_t
+backward compatibility remediation", as implemented now by <https://gcc.gnu.org/
+git/?p=gcc.git;a=commit;h=0c5b35933e5b150df0ab487efb2f11ef5685f713> "libstdc++:
+P1423R3 char8_t remediation (2/4)" for -std=c++2a, deletes operator << overloads
+that would print an integer rather than a (presumably expected) character.
+
+But in these cases printing an integer is as expected, so add explicit casts.
+
+Change-Id: I7c2f1afaa2982b284aef8af183b71466c37142c2
+Reviewed-on: https://gerrit.libreoffice.org/84339
+Tested-by: Jenkins
+Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
+---
+ include/com/sun/star/uno/Any.hxx             | 2 +-
+ sw/source/filter/ww8/docxattributeoutput.cxx | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/include/com/sun/star/uno/Any.hxx b/include/com/sun/star/uno/Any.hxx
+index 05f032fc5b81..c7089a0b5810 100644
+--- a/include/com/sun/star/uno/Any.hxx
++++ b/include/com/sun/star/uno/Any.hxx
+@@ -720,7 +720,7 @@ inline std::basic_ostream<charT, traits> &operator<<(std::basic_ostream<charT, t
+                 std::ios_base::hex, std::ios_base::basefield);
+             charT fill = o.fill('0');
+             o << " U+" << std::setw(4)
+-              << *static_cast<sal_Unicode const *>(any.getValue());
++              << unsigned(*static_cast<sal_Unicode const *>(any.getValue()));
+             o.setf(flgs);
+             o.fill(fill);
+             break;
+diff --git a/sw/source/filter/ww8/docxattributeoutput.cxx b/sw/source/filter/ww8/docxattributeoutput.cxx
+index 91d77e81ddbb..c9b1835ab792 100644
+--- a/sw/source/filter/ww8/docxattributeoutput.cxx
++++ b/sw/source/filter/ww8/docxattributeoutput.cxx
+@@ -2783,7 +2783,7 @@ void DocxAttributeOutput::RunText( const OUString& rText, rtl_TextEncoding /*eCh
+                 if ( *pIt < 0x0020 ) // filter out the control codes
+                 {
+                     impl_WriteRunText( m_pSerializer, nTextToken, pBegin, pIt );
+-                    SAL_INFO("sw.ww8", "Ignored control code in a text run: " << *pIt );
++                    SAL_INFO("sw.ww8", "Ignored control code in a text run: " << unsigned(*pIt) );
+                 }
+                 prevUnicode = *pIt;
+                 break;
+-- 
+2.24.1
+
diff --git a/libreoffice.spec b/libreoffice.spec
index 33bf189..f34e436 100644
--- a/libreoffice.spec
+++ b/libreoffice.spec
@@ -247,6 +247,7 @@ Patch2: 0001-replace-boost-bimap-in-sdext-pdfimport.patch
 Patch3: 0001-fix-detecting-qrcodegen.patch
 Patch4: 0001-Fix-build-with-poppler-0.83.patch
 Patch5: 0001-Adapt-SAL_WARN-to-C-20-deleted-ostream-for-sal_Unico.patch
+Patch6: 0001-Adapt-to-C-20-deleted-ostream-for-sal_Unicode-aka-ch.patch
 
 %if 0%{?rhel}
 # not upstreamed