diff --git a/Marlin/src/pins/stm32f4/pins_ANET_ET4.h b/Marlin/src/pins/stm32f4/pins_ANET_ET4.h
index 01ca4560fe4ac..7c6eaca812d9c 100644
--- a/Marlin/src/pins/stm32f4/pins_ANET_ET4.h
+++ b/Marlin/src/pins/stm32f4/pins_ANET_ET4.h
@@ -206,6 +206,7 @@
   #if DISABLED(SDIO_SUPPORT)
     #define SOFTWARE_SPI
     #define SDSS                            PC11
+    #define SD_SS_PIN                       SDSS
     #define SD_SCK_PIN                      PC12
     #define SD_MISO_PIN                     PC8
     #define SD_MOSI_PIN                     PD2