diff --git a/src/modules/SX128x/SX128x.cpp b/src/modules/SX128x/SX128x.cpp
index b1f47c7e..5cbcc91c 100644
--- a/src/modules/SX128x/SX128x.cpp
+++ b/src/modules/SX128x/SX128x.cpp
@@ -461,7 +461,9 @@ int16_t SX128x::sleep(bool retainConfig) {
   if(!retainConfig) {
     sleepConfig = RADIOLIB_SX128X_SLEEP_DATA_BUFFER_FLUSH | RADIOLIB_SX128X_SLEEP_DATA_RAM_FLUSH;
   }
-  int16_t state = this->mod->SPIwriteStream(RADIOLIB_SX128X_CMD_SET_SLEEP, &sleepConfig, 1, false, false);
+  int16_t state = this->mod->SPIwriteStream(RADIOLIB_SX128X_CMD_SAVE_CONTEXT, 0, 1, false, false);
+  RADIOLIB_ASSERT(state);
+  state = this->mod->SPIwriteStream(RADIOLIB_SX128X_CMD_SET_SLEEP, &sleepConfig, 1, false, false);
 
   // wait for SX128x to safely enter sleep mode
   this->mod->hal->delay(1);
diff --git a/src/modules/SX128x/SX128x.h b/src/modules/SX128x/SX128x.h
index cea6b7ad..02162449 100644
--- a/src/modules/SX128x/SX128x.h
+++ b/src/modules/SX128x/SX128x.h
@@ -22,6 +22,7 @@
 #define RADIOLIB_SX128X_CMD_READ_REGISTER                       0x19
 #define RADIOLIB_SX128X_CMD_WRITE_BUFFER                        0x1A
 #define RADIOLIB_SX128X_CMD_READ_BUFFER                         0x1B
+#define RADIOLIB_SX128X_CMD_SAVE_CONTEXT                        0xD5
 #define RADIOLIB_SX128X_CMD_SET_SLEEP                           0x84
 #define RADIOLIB_SX128X_CMD_SET_STANDBY                         0x80
 #define RADIOLIB_SX128X_CMD_SET_FS                              0xC1