diff --git a/src/main/msp/msp.c b/src/main/msp/msp.c
index 103fd804fb..7d94d3ec74 100644
--- a/src/main/msp/msp.c
+++ b/src/main/msp/msp.c
@@ -1522,6 +1522,12 @@ static bool mspProcessOutCommand(uint8_t cmdMSP, sbuf_t *dst)
         sbufWriteU8(dst, 0);
         sbufWriteU8(dst, 0);
 #endif
+#if defined(USE_ITERM_RELAX)
+        // Added in MSP API 1.42
+        sbufWriteU8(dst, currentPidProfile->iterm_relax_cutoff);
+#else
+        sbufWriteU8(dst, 0);
+#endif
 
         break;
     case MSP_SENSOR_CONFIG:
@@ -2206,6 +2212,14 @@ static mspResult_e mspProcessInCommand(uint8_t cmdMSP, sbuf_t *src)
 #else
             sbufReadU8(src);
             sbufReadU8(src);
+#endif
+        }
+        if(sbufBytesRemaining(src) >= 1) {
+            // Added in MSP API 1.42
+#if defined(USE_ITERM_RELAX)
+            currentPidProfile->iterm_relax_cutoff = sbufReadU8(src);
+#else
+            sbufReadU8(src);
 #endif
         }
         pidInitConfig(currentPidProfile);