diff --git a/lib/system/freertos/alloc.h b/lib/system/freertos/alloc.h
index 439e28903..c4d5b0d22 100644
--- a/lib/system/freertos/alloc.h
+++ b/lib/system/freertos/alloc.h
@@ -42,6 +42,9 @@
 
 #include "FreeRTOS.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 static inline void *metal_allocate_memory(unsigned int size)
 {
diff --git a/lib/system/freertos/irq.h b/lib/system/freertos/irq.h
index 178114868..7e0d915a4 100644
--- a/lib/system/freertos/irq.h
+++ b/lib/system/freertos/irq.h
@@ -40,6 +40,10 @@
 #ifndef __METAL_FREERTOS_IRQ__H__
 #define __METAL_FREERTOS_IRQ__H__
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * @brief      default interrupt handler 
  * @param[in]  interrupt vector