diff --git a/MozillaThunderbird.changes b/MozillaThunderbird.changes
index 993a1d4..5fdc6ee 100644
--- a/MozillaThunderbird.changes
+++ b/MozillaThunderbird.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Thu Jan 20 13:10:00 UTC 2022 - Martin Liška <mliska@suse.cz>
+
+- Enable -fimplicit-constexpr for GCC 12+.
+
 -------------------------------------------------------------------
 Fri Jan  7 16:13:57 UTC 2022 - Wolfgang Rosenauer <wr@rosenauer.org>
 
diff --git a/MozillaThunderbird.spec b/MozillaThunderbird.spec
index ebe4049..a817e70 100644
--- a/MozillaThunderbird.spec
+++ b/MozillaThunderbird.spec
@@ -357,6 +357,9 @@ export CC=gcc-9
 %if 0%{?clang_build} == 0
 export CC=gcc
 export CXX=g++
+%if 0%{?gcc_version:%{gcc_version}} >= 12
+export CFLAGS="$CFLAGS -fimplicit-constexpr"
+%endif
 %endif
 %endif
 %ifarch %arm %ix86