diff --git a/configure.ac b/configure.ac
index c452cf5d3..5bb76fe00 100644
--- a/configure.ac
+++ b/configure.ac
@@ -763,6 +763,7 @@ AC_DEFINE([_GNU_SOURCE],[1],[Use GNU C library extensions (e.g. stdndup).])
 GCC_WARNINGS="-Wall -Wstrict-prototypes -Wformat-security -Wshadow"
 AS_IF([test "x${gcc_wextra}" = "xyes"], [
   GCC_WARNINGS="${GCC_WARNINGS} -Wextra -Wno-unused-parameter"
+  GCC_WARNINGS="${GCC_WARNINGS} -Wno-gnu-folding-constant"
   GCC_WARNINGS="${GCC_WARNINGS} -Wbad-function-cast"
   GCC_WARNINGS="${GCC_WARNINGS} -Wcast-align"
   GCC_WARNINGS="${GCC_WARNINGS} -Wredundant-decls"