diff --git a/common/utils/threadPool/task_ans.h b/common/utils/threadPool/task_ans.h
index 4d1203555d..9bdf55b291 100644
--- a/common/utils/threadPool/task_ans.h
+++ b/common/utils/threadPool/task_ans.h
@@ -31,7 +31,9 @@ extern "C" {
 #include <stdatomic.h>
 #else
 #include <atomic>
+#ifndef _Atomic
 #define _Atomic(X) std::atomic<X>
+#endif
 #define _Alignas(X) alignas(X)
 #endif
 
diff --git a/openair1/PHY/defs_nr_UE.h b/openair1/PHY/defs_nr_UE.h
index b64cb20752..dd035a73e3 100644
--- a/openair1/PHY/defs_nr_UE.h
+++ b/openair1/PHY/defs_nr_UE.h
@@ -34,8 +34,10 @@
 
 #ifdef __cplusplus
 #include <atomic>
+#ifndef _Atomic
 #define _Atomic(X) std::atomic< X >
 #endif
+#endif
 
 #include "defs_nr_common.h"
 #include "CODING/nrPolar_tools/nr_polar_pbch_defs.h"