diff --git a/src/freedombone-image-makefile b/src/freedombone-image-makefile
index 8d87c5fe97a421729fadeed8a968fc0b84986a97..bfa33b5f0d343c0e16edbe47410a0fc0e17e6c71 100755
--- a/src/freedombone-image-makefile
+++ b/src/freedombone-image-makefile
@@ -34,11 +34,11 @@ SUITE ?= stretch
 SOURCE ?= false
 
 # yes no
-if [ $$MACHINE = all ]; then \
-	BUILD = $(ARCHITECTURE); \
-else \
-	BUILD = $(MACHINE)-$(ARCHITECTURE); \
-fi
+ifeq ($(MACHINE),all)
+	BUILD = $(ARCHITECTURE)
+else
+	BUILD = $(MACHINE)-$(ARCHITECTURE)
+endif
 NAME = build/$(PROJECT_NAME)-$(IMAGE_NAME)-$(BUILD)
 IMAGE = $(NAME).img
 ARCHIVE = $(IMAGE).xz