diff --git a/configure.ac.in b/configure.ac.in
index bc4a656b..010b9d12 100644
--- a/configure.ac.in
+++ b/configure.ac.in
@@ -568,7 +568,7 @@ AC_ARG_ENABLE([debug],
 if test "x$want_debug" = "xyes" -a $ac_cv_c_compiler_gnu != no; then
   CFLAGS="$CFLAGS -g3 -Werror"
 dnl for more 'extreme' testing
-dnl  CFLAGS="$CFLAGS -g3 -Werror -Wextra -Wunused -Wdeclaration-after-statement -Wundef -Wendif-labels -Wshadow -Wpointer-arith -Wbad-function-cast -Wcast-qual -Wcast-align -Wwrite-strings -Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes -Winline -Wmissing-declarations -Wmissing-noreturn -Wmissing-format-attribute -Wredundant-decls -std=c99 -pedantic -g"
+dnl  CFLAGS="$CFLAGS -g3 -Werror -Wextra -Wunused -Wdeclaration-after-statement -Wundef -Wendif-labels -Wshadow -Wpointer-arith -Wbad-function-cast -Wcast-qual -Wcast-align -Wwrite-strings -Wstrict-prototypes -Wold-style-definition -Winline -Wmissing-noreturn -Wmissing-format-attribute -Wredundant-decls -std=c99 -pedantic -g"
   AC_DEFINE([DEBUG], [], [Define for debugging])
 fi