diff --git a/configure.ac b/configure.ac
index 8a73793ce..46493d8b6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -130,6 +130,7 @@ AC_DEFUN([_MY_CXX_CHECK_OPT],
 # Flags for compiling Verilator internals including parser
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-Wno-unused-parameter)
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-Wno-char-subscripts)
+_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-Wno-undefined-bool-conversion)
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-Qunused-arguments)
 AC_SUBST(CFG_CXXFLAGS_SRC)