diff --git a/poky/meta/classes/rootfs_rpm.bbclass b/poky/meta/classes/rootfs_rpm.bbclass
index 0af7d65..3d8d784 100644
--- a/poky/meta/classes/rootfs_rpm.bbclass
+++ b/poky/meta/classes/rootfs_rpm.bbclass
@@ -9,7 +9,7 @@
 export STAGING_LIBDIR
 
 # Add 100Meg of extra space for dnf
-IMAGE_ROOTFS_EXTRA_SPACE_append = "${@bb.utils.contains("PACKAGE_INSTALL", "dnf", " + 102400", "", d)}"
+IMAGE_ROOTFS_EXTRA_SPACE:append = "${@bb.utils.contains("PACKAGE_INSTALL", "dnf", " + 102400", "", d)}"
 
 # Dnf is python based, so be sure python3-native is available to us.
 EXTRANATIVEPATH += "python3-native"