diff --git a/configure.ac b/configure.ac
index 71e9cc7..132065f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -188,6 +188,7 @@ cygwin*|mingw*)
   ;;
 beos*|haiku*)
   AC_DEFINE(SOUND_BEOS)
+  CFLAGS="${CFLAGS} -Wno-multichar"
   DRIVERS="${DRIVERS} sound_beos.o"
   LIBS="${LIBS} -lmedia -lbe"
   ;;