diff --git a/components/freertos/include/freertos/portmacro.h b/components/freertos/include/freertos/portmacro.h
index 6c53c425d2..ea149b6630 100644
--- a/components/freertos/include/freertos/portmacro.h
+++ b/components/freertos/include/freertos/portmacro.h
@@ -315,7 +315,7 @@ typedef struct {
 #endif
 
 
-void _xt_coproc_release(void * coproc_sa_base);
+void _xt_coproc_release(volatile void * coproc_sa_base);
 
 
 // porttrace