diff --git a/tools/munger/Makefile b/tools/munger/Makefile
index c89b937..9d2ad53 100644
--- a/tools/munger/Makefile
+++ b/tools/munger/Makefile
@@ -28,9 +28,11 @@
 CSTRUCT_DEP += $(wildcard ${PYLIBOF_DIR}/pylib/of/*.py) 
 
 # Generated and other files
-GEN_FILES := $(addprefix ${TARGET_DIR}/,cstruct.py message.py error.py action.py)
+GEN_FILES := $(addprefix ${TARGET_DIR}/,cstruct.py message.py error.py \
+	action.py)
+# class_maps is generated as a side effect of cstruct....
 OTHER_FILES :=  $(addprefix ${TARGET_DIR}/,action_list.py parse.py \
-	controller.py dataplane.py)
+	controller.py dataplane.py class_maps.py)
 LINT_SOURCE := ${GEN_FILES} ${OTHER_FILES}
 LINT_FILES := $(subst .py,.log,${LINT_SOURCE})
 LINT_FILES := $(subst ${TARGET_DIR}/,lint/,${LINT_FILES})