diff --git a/arch/renesas/include/rx65n/limits.h b/arch/renesas/include/rx65n/limits.h
index b29405a029d..c31b510c5ff 100644
--- a/arch/renesas/include/rx65n/limits.h
+++ b/arch/renesas/include/rx65n/limits.h
@@ -36,7 +36,7 @@
 #ifndef __ARCH_RENESAS_INCLUDE_RX65N_LIMITS_H
 #define __ARCH_RENESAS_INCLUDE_RX65N_LIMITS_H
 
-=/****************************************************************************
+/****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
 
diff --git a/arch/renesas/src/rx65n/rx65n_sci.c b/arch/renesas/src/rx65n/rx65n_sci.c
index 5a92dc86ba6..138257bc5e6 100644
--- a/arch/renesas/src/rx65n/rx65n_sci.c
+++ b/arch/renesas/src/rx65n/rx65n_sci.c
@@ -382,7 +382,7 @@ static inline void rx_mpc_disable(void)
   SYSTEM.PRCR.WORD = 0xa500u;
 }
 
-=/****************************************************************************
+/****************************************************************************
  * Name: sci0_init_port
  *
  * Description:
diff --git a/arch/renesas/src/rx65n/rx65n_sigdeliver.c b/arch/renesas/src/rx65n/rx65n_sigdeliver.c
index 9aca8188d28..85fded0a578 100644
--- a/arch/renesas/src/rx65n/rx65n_sigdeliver.c
+++ b/arch/renesas/src/rx65n/rx65n_sigdeliver.c
@@ -51,7 +51,7 @@
 #include "up_internal.h"
 #include "up_arch.h"
 
-=/****************************************************************************
+/****************************************************************************
  * Public Functions
  ****************************************************************************/