diff --git a/linux/linux.mk b/linux/linux.mk
index 2a29de8..2fb890e 100644
--- a/linux/linux.mk
+++ b/linux/linux.mk
@@ -230,7 +230,7 @@ $(LINUX_DIR)/.stamp_initramfs_rebuilt: $(LINUX_DIR)/.stamp_target_installed $(LI
 	# Copy the kernel image to its final destination
 	cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
 	# If there is a .ub file copy it to the final destination
-	test -f $(LINUX_IMAGE_PATH).ub && cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)
+	test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)
 	$(Q)touch $@
 
 # The initramfs building code must make sure this target gets called