diff --git a/src/processor/range_map-inl.h b/src/processor/range_map-inl.h
index 17169ea4..77bf7d20 100644
--- a/src/processor/range_map-inl.h
+++ b/src/processor/range_map-inl.h
@@ -37,6 +37,8 @@
 #define PROCESSOR_RANGE_MAP_INL_H__
 
 
+#include <cassert>
+
 #include "processor/range_map.h"
 #include "processor/logging.h"