diff --git a/libraries/AP_Baro/AP_Baro.h b/libraries/AP_Baro/AP_Baro.h
index ba76b23419..a1b4b63242 100644
--- a/libraries/AP_Baro/AP_Baro.h
+++ b/libraries/AP_Baro/AP_Baro.h
@@ -58,9 +58,9 @@ public:
     bool healthy(void) const { return healthy(_primary); }
 #ifdef HAL_BUILD_AP_PERIPH
     // calibration and alt check not valid for AP_Periph
-    bool healthy(uint8_t instance) const { return sensors[instance].healthy; }
+    bool healthy(uint8_t instance) const;
 #else
-    bool healthy(uint8_t instance) const { return sensors[instance].healthy && sensors[instance].alt_ok && sensors[instance].calibrated; }
+    bool healthy(uint8_t instance) const;
 #endif
 
     // check if all baros are healthy - used for SYS_STATUS report