diff --git a/.github/workflows/firmware-qemu.yml b/.github/workflows/firmware-qemu.yml
index 40f42c32..d6dae98b 100644
--- a/.github/workflows/firmware-qemu.yml
+++ b/.github/workflows/firmware-qemu.yml
@@ -152,6 +152,7 @@ jobs:
           python3 -m esptool --chip esp32s3 merge_bin \
             -o build/qemu_flash.bin \
             --flash_mode dio --flash_freq 80m --flash_size 8MB \
+            --fill-flash-size 8MB \
             0x0     build/bootloader/bootloader.bin \
             0x8000  build/partition_table/partition-table.bin \
             $OTA_ARGS \
@@ -339,6 +340,7 @@ jobs:
           python3 -m esptool --chip esp32s3 merge_bin \
             -o build/qemu_flash.bin \
             --flash_mode dio --flash_freq 80m --flash_size 8MB \
+            --fill-flash-size 8MB \
             0x0     build/bootloader/bootloader.bin \
             0x8000  build/partition_table/partition-table.bin \
             0x20000 build/esp32-csi-node.bin