diff --git a/pdf2djvu.changes b/pdf2djvu.changes
index a94496b..5c53774 100644
--- a/pdf2djvu.changes
+++ b/pdf2djvu.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Thu Jul  4 08:44:35 UTC 2024 - Christophe Marin <christophe@krop.fr>
+
+- Enforce c++20 on factory to fix build failures with
+  poppler >= 24.05
+
 -------------------------------------------------------------------
 Mon Jan  9 14:14:57 UTC 2023 - pgajdos@suse.com
 
diff --git a/pdf2djvu.spec b/pdf2djvu.spec
index dd9152a..b4ef5ea 100644
--- a/pdf2djvu.spec
+++ b/pdf2djvu.spec
@@ -47,8 +47,10 @@ metadata (including XMP metadata).
 %autosetup -p1
 
 %build
-%if 0%{?suse_version} < 1550
+%if 0%{?suse_version} == 1500
 export CXXFLAGS="%{optflags} -std=c++17"
+%else
+export CXXFLAGS="%{optflags} -std=c++20"
 %endif
 %configure
 %make_build