diff --git a/os/io/platforms/LPC214x/serial_lld.h b/os/io/platforms/LPC214x/serial_lld.h
index 859983528..b576a3e6e 100644
--- a/os/io/platforms/LPC214x/serial_lld.h
+++ b/os/io/platforms/LPC214x/serial_lld.h
@@ -162,7 +162,6 @@ extern SerialDriver COM1;
 #if USE_LPC214x_UART1
 extern SerialDriver COM2;
 #endif
-/** @endcond*/
 
 #ifdef __cplusplus
 extern "C" {
@@ -173,6 +172,7 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
+/** @endcond*/
 
 #endif /* _SERIAL_LLD_H_ */
 
diff --git a/os/io/platforms/STM32F103/serial_lld.h b/os/io/platforms/STM32F103/serial_lld.h
index daa92c547..89b28815f 100644
--- a/os/io/platforms/STM32F103/serial_lld.h
+++ b/os/io/platforms/STM32F103/serial_lld.h
@@ -189,7 +189,6 @@ extern SerialDriver COM2;
 #if USE_STM32_USART3
 extern SerialDriver COM3;
 #endif
-/** @endcond*/
 
 #ifdef __cplusplus
 extern "C" {
@@ -200,6 +199,7 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
+/** @endcond*/
 
 #endif /* _SERIAL_LLD_H_ */