diff --git a/meta-digi-del/recipes-core/images/del-image-minimal-dev.bb b/meta-digi-del/recipes-core/images/del-image-minimal-dev.bb
index 405a838a6..00f621650 100644
--- a/meta-digi-del/recipes-core/images/del-image-minimal-dev.bb
+++ b/meta-digi-del/recipes-core/images/del-image-minimal-dev.bb
@@ -11,13 +11,13 @@ LICENSE = "MIT"
 
 inherit core-image
 
-IMAGE_FEATURES = "core-ssh-dropbear"
+IMAGE_FEATURES += "core-ssh-dropbear"
 IMAGE_FEATURES += "dev-pkgs"
 
 # Adding debug-tweaks will enable empty password login.
 # Note that adding debug-tweaks to EXTRA_IMAGE_FEATURES will not
 # allow for empty password logins.
-IMAGE_FEATURES =+ "debug-tweaks"
+IMAGE_FEATURES += "debug-tweaks"
 
 # core-image disables the root password if debug-tweak is not enabled.
 # This override will use the shadow file instead.
diff --git a/meta-digi-del/recipes-core/images/del-image-minimal.bb b/meta-digi-del/recipes-core/images/del-image-minimal.bb
index a2873d2a4..fd31a8ae2 100644
--- a/meta-digi-del/recipes-core/images/del-image-minimal.bb
+++ b/meta-digi-del/recipes-core/images/del-image-minimal.bb
@@ -16,7 +16,7 @@ inherit del-image
 # where they can be customized by platform.
 
 # Only common features to remain here.
-IMAGE_FEATURES = "ssh-server-dropbear"
+IMAGE_FEATURES += "ssh-server-dropbear"
 IMAGE_FEATURES += "del-network"
 
 # Machine dependant features