diff --git a/libbacktrace/BacktraceMap.cpp b/libbacktrace/BacktraceMap.cpp
index b0ada46..ca47f67 100644
--- a/libbacktrace/BacktraceMap.cpp
+++ b/libbacktrace/BacktraceMap.cpp
@@ -135,7 +135,7 @@
 #if defined(__APPLE__)
 // Corkscrew and libunwind don't compile on the mac, so create a generic
 // map object.
-BacktraceMap* BacktraceMap::Create(pid_t pid, bool uncached) {
+BacktraceMap* BacktraceMap::Create(pid_t pid, bool /*uncached*/) {
   BacktraceMap* map = new BacktraceMap(pid);
   if (!map->Build()) {
     delete map;