1 files changed, 3 insertions, 2 deletions
diff --git a/absl/synchronization/mutex.cc b/absl/synchronization/mutex.cc
index 69ef9135..64177360 100644
--- a/absl/synchronization/mutex.cc
+++ b/absl/synchronization/mutex.cc
@@ -36,6 +36,7 @@
 #include <algorithm>
 #include <atomic>
 #include <cinttypes>
+#include <cstddef>
 #include <thread>  // NOLINT(build/c++11)
 
 #include "absl/base/attributes.h"
@@ -430,8 +431,8 @@ static void PostSynchEvent(void *obj, int ev) {
     char buffer[ABSL_ARRAYSIZE(pcs) * 24];
     int pos = snprintf(buffer, sizeof (buffer), " @");
     for (int i = 0; i != n; i++) {
-      int b = snprintf(&buffer[pos], sizeof (buffer) - pos, " %p", pcs[i]);
-      if (b < 0 || b >= sizeof (buffer) - pos) {
+      int b = snprintf(&buffer[pos], sizeof(buffer) - pos, " %p", pcs[i]);
+      if (b < 0 || static_cast<size_t>(b) >= sizeof(buffer) - pos) {
         break;
       }
       pos += b;