diff --git a/intern/cycles/util/util_logging.h b/intern/cycles/util/util_logging.h
index 6380cb13a9b..492f830e67c 100644
--- a/intern/cycles/util/util_logging.h
+++ b/intern/cycles/util/util_logging.h
@@ -21,6 +21,8 @@
 #  include <glog/logging.h>
 #endif
 
+#include <iostream>
+
 CCL_NAMESPACE_BEGIN
 
 #if !defined(WITH_CYCLES_LOGGING) || defined(__KERNEL_GPU__)