diff --git a/bear.spec b/bear.spec
index 5a276d8..377dcfb 100644
--- a/bear.spec
+++ b/bear.spec
@@ -48,6 +48,15 @@ for f in $(ls test/bin/); do
     sed -i "s|^#\!/usr/bin/env\s\+python\s\?$|#!%{__python3}|" test/bin/$f
 done
 
+# Temporary workaround for API changes in fmt 9.0. See:
+#
+# Build failure with fmt-9.0.0
+# https://github.com/rizsotto/Bear/issues/471
+#
+# Note that this macro will be removed in fmt 10.0.
+%set_build_flags
+export CXXFLAGS="${CXXFLAGS} -DFMT_DEPRECATED_OSTREAM"
+
 # Functional tests are broken for some unknown reason, disable for now.
 %cmake -DENABLE_FUNC_TESTS=ON -DENABLE_UNIT_TESTS=ON
 %cmake_build