--- a/src/client/windows/crash_generation/crash_generation_server.cc
+++ b/src/client/windows/crash_generation/crash_generation_server.cc
@@ -954,7 +954,7 @@ bool CrashGenerationServer::GenerateDump(const ClientInfo& client,
     }
 
     // Allocate AppMemory instances for exception context.
-    for (int i = 0; i < kExceptionAppMemoryRegions; i++) {
+    for (size_t i = 0; i < kExceptionAppMemoryRegions; i++) {
       AppMemory app_memory;
       app_memory.ptr = reinterpret_cast<ULONG64>(nullptr);
       app_memory.length = 0;