diff --git a/gadget-amd64.yaml b/gadget-amd64.yaml
index 59604db..63680a9 100644
--- a/gadget-amd64.yaml
+++ b/gadget-amd64.yaml
@@ -18,7 +18,8 @@ volumes:
         type: EF,C12A7328-F81F-11D2-BA4B-00A0C93EC93B
         filesystem: vfat
         filesystem-label: system-boot
-        size: 256M
+        min-size: 256M
+        size: 260M
         content:
           - source: shimx64.efi
             target: EFI/BOOT/BOOTX64.EFI
diff --git a/gadget-arm64.yaml b/gadget-arm64.yaml
index fbd11fe..6f96b17 100644
--- a/gadget-arm64.yaml
+++ b/gadget-arm64.yaml
@@ -6,7 +6,8 @@ volumes:
         type: EF,C12A7328-F81F-11D2-BA4B-00A0C93EC93B
         filesystem: vfat
         filesystem-label: system-boot
-        size: 256M
+        min-size: 256M
+        size: 260M
         content:
           - source: shimaa64.efi
             target: EFI/BOOT/BOOTAA64.efi