diff --git a/Makefile b/Makefile
index 372828b..bca5edf 100644
--- a/Makefile
+++ b/Makefile
@@ -244,7 +244,7 @@ CFLAGS += -DBLE_STACK_SUPPORT_REQD
 CFLAGS += -DSWI_DISABLE0
 CFLAGS += -DSOFTDEVICE_PRESENT
 CFLAGS += -DFLOAT_ABI_HARD
-CFLAGS += -DDFU_APP_DATA_RESERVED=7*4096
+CFLAGS += -DDFU_APP_DATA_RESERVED=0
 CFLAGS += $(MCU_FLAGS)
 
 CFLAGS += -DUF2_VERSION='"$(GIT_VERSION) $(GIT_SUBMODULE_VERSIONS) $(SD_NAME) $(SD_VERSION)"'
diff --git a/src/main.c b/src/main.c
index 209d00e..f2c58ec 100644
--- a/src/main.c
+++ b/src/main.c
@@ -122,11 +122,11 @@ enum { BLE_CONN_CFG_HIGH_BANDWIDTH = 1 };
 
 #ifdef NRF52840_XXAA
   // Flash 1024 KB
-  STATIC_ASSERT( APPDATA_ADDR_START == 0xED000);
+  STATIC_ASSERT( APPDATA_ADDR_START == 0xF4000);
 
 #else
   // Flash 512 KB
-  STATIC_ASSERT( APPDATA_ADDR_START == 0x71000);
+  STATIC_ASSERT( APPDATA_ADDR_START == 0x78000);
 #endif