diff --git a/simpletrace.c b/simpletrace.c
index f1dbb5e..de355e9 100644
--- a/simpletrace.c
+++ b/simpletrace.c
@@ -119,7 +119,7 @@
     TraceRecord record;
     unsigned int writeout_idx = 0;
     unsigned int num_available, idx;
-    size_t unused;
+    size_t unused __attribute__ ((unused));
 
     for (;;) {
         wait_for_trace_records_available();