diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_PulsedLightLRF.h b/libraries/AP_RangeFinder/AP_RangeFinder_PulsedLightLRF.h
index 999d73ed72..b242bbfb8b 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_PulsedLightLRF.h
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_PulsedLightLRF.h
@@ -36,7 +36,7 @@
 #define AP_RANGEFINDER_PULSEDLIGHTLRF_DISTLOW_REG           0x10    // low byte of distance measurement
 
 // command register values
-#define AP_RANGEFINDER_PULSEDLIGHTLRF_MSRREG_ACQUIRE        0x61
+#define AP_RANGEFINDER_PULSEDLIGHTLRF_MSRREG_ACQUIRE        0x04    // Varies based on sensor revision, 0x04 is newest, 0x61 is older
 
 class AP_RangeFinder_PulsedLightLRF : public RangeFinder
 {