diff --git a/coverage-tool/coverage-plugin/coverage_trace.cc b/coverage-tool/coverage-plugin/coverage_trace.cc
index d2b13fdc954d66b2c71b310127e9bd3790a5d247..24a81fb1262fbd3ba4c2714b711ac506e2dbe4a9 100644
--- a/coverage-tool/coverage-plugin/coverage_trace.cc
+++ b/coverage-tool/coverage-plugin/coverage_trace.cc
@@ -307,8 +307,9 @@ CoverageTrace::Save(void)
         // Dump the detailed stats
         for (map_it = rtc->stats.begin(); map_it != rtc->stats.end();
             ++map_it) {
-            fprintf(fp, "%08x %lu %lu\n", map_it->first, map_it->second.cnt,
-                    map_it->second.size);
+            fprintf(fp, "%08x %lu %lu\n", (unsigned int)map_it->first,
+                      (unsigned long)map_it->second.cnt,
+                      (unsigned long)map_it->second.size);
         }
 
         // Close the file