diff --git a/m4/gccwarn.m4 b/m4/gccwarn.m4
index 8d1a53e1b..e5b316923 100644
--- a/m4/gccwarn.m4
+++ b/m4/gccwarn.m4
@@ -41,7 +41,8 @@ EOF
    Wlogical-op \
    Wduplicated-cond \
    Wnull-dereference \
-   Wsuggest-override
+   Wsuggest-override \
+   Wpedantic
   do
     CXXFLAGS="$cf_save_CXXFLAGS $ac_cv_prog_gxx_warn_flags -$cf_opt"
     if AC_TRY_EVAL(ac_compile); then