diff --git a/src/setup.h b/src/setup.h
index 4d49190a8ec18cb86b8a1306b22a470175c81df0..799b98c8beea96c6e4c09297e99da3cbfa74a8cd 100644
--- a/src/setup.h
+++ b/src/setup.h
@@ -97,4 +97,8 @@ int fileno( FILE *stream);
 #define USE_ENVIRONMENT
 #endif
 
+#ifdef __BEOS__
+#define typedef_bool
+#endif
+
 #endif /* __SETUP_H */