diff --git a/Firmware/variants/1_75mm_MK25S-RAMBo13a-E3Dv6full.h b/Firmware/variants/1_75mm_MK25S-RAMBo13a-E3Dv6full.h
index 51644aaf4..f6aeb8f51 100644
--- a/Firmware/variants/1_75mm_MK25S-RAMBo13a-E3Dv6full.h
+++ b/Firmware/variants/1_75mm_MK25S-RAMBo13a-E3Dv6full.h
@@ -12,7 +12,7 @@
 #define PRINTER_NAME PRINTER_MK25S_NAME
 #define PRINTER_MMU_TYPE PRINTER_MK25S_MMU2
 #define PRINTER_MMU_NAME PRINTER_MK25S_MMU2_NAME
-#define FILAMENT_SIZE "1_75mm_MK25"
+#define FILAMENT_SIZE "1_75mm_MK25S"
 #define NOZZLE_TYPE "E3Dv6full"
 
 // Developer flag
diff --git a/Firmware/variants/1_75mm_MK3S-EINSy10a-E3Dv6full.h b/Firmware/variants/1_75mm_MK3S-EINSy10a-E3Dv6full.h
index dbc92ac06..85d1ee69f 100644
--- a/Firmware/variants/1_75mm_MK3S-EINSy10a-E3Dv6full.h
+++ b/Firmware/variants/1_75mm_MK3S-EINSy10a-E3Dv6full.h
@@ -12,7 +12,7 @@
 #define PRINTER_NAME PRINTER_MK3S_NAME
 #define PRINTER_MMU_TYPE PRINTER_MK3S_MMU2
 #define PRINTER_MMU_NAME PRINTER_MK3S_MMU2_NAME
-#define FILAMENT_SIZE "1_75mm_MK3"
+#define FILAMENT_SIZE "1_75mm_MK3S"
 #define NOZZLE_TYPE "E3Dv6full"
 
 // Developer flag