diff --git a/tools/gn/xcode_writer.cc b/tools/gn/xcode_writer.cc
index f5dd65a..37c23e2 100644
--- a/tools/gn/xcode_writer.cc
+++ b/tools/gn/xcode_writer.cc
@@ -48,9 +48,13 @@
 };
 
 SafeEnvironmentVariableInfo kSafeEnvironmentVariables[] = {
-    {"HOME", true}, {"LANG", true},    {"PATH", true},
-    {"USER", true}, {"TMPDIR", false},
-};
+    {"HOME", true},
+    {"LANG", true},
+    {"PATH", true},
+    {"USER", true},
+    {"TMPDIR", false},
+    {"ICECC_VERSION", true},
+    {"ICECC_CLANG_REMOTE_CPP", true}};
 
 XcodeWriter::TargetOsType GetTargetOs(const Args& args) {
   const Value* target_os_value = args.GetArgOverride(variables::kTargetOs);