diff --git a/configure.ac b/configure.ac
index e7f87331..1b5590ae 100644
--- a/configure.ac
+++ b/configure.ac
@@ -115,7 +115,7 @@ AC_SUBST(CORE_STATE_DIR)
 
 # default compiler flags
 # _GNU_SOURCE is defined to get c99 defines for lrint()
-CFLAGS="$CFLAGS -O3 -Werror -Wall -D_GNU_SOURCE"
+CFLAGS="$CFLAGS -O3 -Werror -Wall -Wno-int-in-bool-context -D_GNU_SOURCE"
 # debug flags
 #CFLAGS="$CFLAGS -g -Werror -Wall -D_GNU_SOURCE"