diff --git a/configure.ac b/configure.ac
index 2a628d7cb..261304370 100644
--- a/configure.ac
+++ b/configure.ac
@@ -43,9 +43,7 @@ AC_ARG_ENABLE([compile-warnings],
        PICKY_CXXFLAGS="-Wextra -pedantic -Wno-long-long -Weffc++ -Wmissing-declarations"
        ;;
      error)
-       # remove -Wno-c++17-extensions once protocolbuffers/protobuf#9181 is
-       # resolved
-       WARNING_CXXFLAGS="-Wall -Werror -Wno-c++17-extensions"
+       WARNING_CXXFLAGS="-Wall -Werror"
        PICKY_CXXFLAGS="-Wextra -pedantic -Wno-long-long -Weffc++ -Wmissing-declarations"
        ;;
      distcheck)