diff --git a/tools/hprof-conv/HprofConv.c b/tools/hprof-conv/HprofConv.c
index cc90176..c8847c9 100644
--- a/tools/hprof-conv/HprofConv.c
+++ b/tools/hprof-conv/HprofConv.c
@@ -663,7 +663,8 @@
 
         unsigned char* buf = ebGetBuffer(pBuf);
         unsigned char type;
-        unsigned int timestamp, length;
+        unsigned int timestamp ATTRIBUTE_UNUSED;
+        unsigned int length;
 
         type = buf[0];
         timestamp = get4BE(buf + 1);