diff --git a/libraries/AP_RPM/AP_RPM.cpp b/libraries/AP_RPM/AP_RPM.cpp
index 8bd1bf605b..d63652e970 100644
--- a/libraries/AP_RPM/AP_RPM.cpp
+++ b/libraries/AP_RPM/AP_RPM.cpp
@@ -110,7 +110,7 @@ void AP_RPM::init(void)
         return;
     }
     for (uint8_t i=0; i<RPM_MAX_INSTANCES; i++) {
-#if CONFIG_HAL_BOARD == HAL_BOARD_PX4  || CONFIG_HAL_BOARD == HAL_BOARD_VRBRAIN
+#if (CONFIG_HAL_BOARD == HAL_BOARD_PX4) || ((CONFIG_HAL_BOARD == HAL_BOARD_VRBRAIN) && (!defined(CONFIG_ARCH_BOARD_VRBRAIN_V51) && !defined(CONFIG_ARCH_BOARD_VRUBRAIN_V52)))
         uint8_t type = _type[num_instances];
         uint8_t instance = num_instances;
 
diff --git a/libraries/AP_RPM/RPM_PX4_PWM.cpp b/libraries/AP_RPM/RPM_PX4_PWM.cpp
index 2411246ce0..fddd86b48a 100644
--- a/libraries/AP_RPM/RPM_PX4_PWM.cpp
+++ b/libraries/AP_RPM/RPM_PX4_PWM.cpp
@@ -15,7 +15,7 @@
 
 #include <AP_HAL/AP_HAL.h>
 
-#if CONFIG_HAL_BOARD == HAL_BOARD_PX4 || CONFIG_HAL_BOARD == HAL_BOARD_VRBRAIN
+#if (CONFIG_HAL_BOARD == HAL_BOARD_PX4) || ((CONFIG_HAL_BOARD == HAL_BOARD_VRBRAIN) && (!defined(CONFIG_ARCH_BOARD_VRBRAIN_V51) && !defined(CONFIG_ARCH_BOARD_VRUBRAIN_V52)))
 #include <AP_BoardConfig/AP_BoardConfig.h>
 #include "RPM_PX4_PWM.h"