diff --git a/autogen/configure b/autogen/configure
index 31105ddbaf7..97e8078d4ec 100755
--- a/autogen/configure
+++ b/autogen/configure
@@ -7585,6 +7585,7 @@ fi
                                     # signed overflow has undefined behavior
   nw="$nw -Wsync-nand"              # irrelevant here, and provokes ObjC warning
   nw="$nw -Wunsafe-loop-optimizations" # OK to suppress unsafe optimizations
+  nw="$nw -Wbad-function-cast"      # These casts are no worse than others.
 
   # Emacs doesn't care about shadowing; see
   # <http://lists.gnu.org/archive/html/emacs-diffs/2011-11/msg00265.html>.