diff --git a/src/main/target/STM32_UNIFIED/target.mk b/src/main/target/STM32_UNIFIED/target.mk
index 0ce9a5579d..d9ea02eb06 100644
--- a/src/main/target/STM32_UNIFIED/target.mk
+++ b/src/main/target/STM32_UNIFIED/target.mk
@@ -1,10 +1,6 @@
 ifeq ($(TARGET), STM32F405)
 F405_TARGETS += $(TARGET)
 
-# Use a full block (16 kB) of flash for custom defaults - with 1 MB flash we have more than we know how to use anyway
-
-CUSTOM_DEFAULTS_EXTENDED = yes
-
 else
 ifeq ($(TARGET), STM32F411)
 F411_TARGETS += $(TARGET)
@@ -20,6 +16,13 @@ endif
 endif
 endif
 
+ifeq ($(TARGET), $(filter $(TARGET), STM32F405 STM32F745))
+# Use a full block (16 kB) of flash for custom defaults - with 1 MB flash we have more than we know how to use anyway
+
+CUSTOM_DEFAULTS_EXTENDED = yes
+endif
+
+
 FEATURES       += VCP SDCARD_SPI SDCARD_SDIO ONBOARDFLASH
 
 TARGET_SRC = \