Index: source/Symbol/ClangASTContext.cpp
===================================================================
--- source/Symbol/ClangASTContext.cpp
+++ source/Symbol/ClangASTContext.cpp
@@ -5876,7 +5876,7 @@
                     if (element_type.GetCompleteType())
                     {
                         char element_name[64];
-                        ::snprintf (element_name, sizeof (element_name), "[%zu]", idx);
+                        ::snprintf (element_name, sizeof (element_name), "[%" PRIu64 "]", static_cast<uint64_t>(idx));
                         child_name.assign(element_name);
                         child_byte_size = element_type.GetByteSize(exe_ctx ? exe_ctx->GetBestExecutionContextScope() : NULL);
                         child_byte_offset = (int32_t)idx * (int32_t)child_byte_size;
@@ -5897,7 +5897,7 @@
                     if (element_type.GetCompleteType())
                     {
                         char element_name[64];
-                        ::snprintf (element_name, sizeof (element_name), "[%zu]", idx);
+                        ::snprintf (element_name, sizeof (element_name), "[%" PRIu64 "]", static_cast<uint64_t>(idx));
                         child_name.assign(element_name);
                         child_byte_size = element_type.GetByteSize(exe_ctx ? exe_ctx->GetBestExecutionContextScope() : NULL);
                         child_byte_offset = (int32_t)idx * (int32_t)child_byte_size;