diff --git a/glafp-utils/sgmlverb/Makefile b/glafp-utils/sgmlverb/Makefile
index dc0eccae475003418f3d5b2980d5070f8c362707..4ae120326fe0c33be4d005a95199314433ebce59 100644
--- a/glafp-utils/sgmlverb/Makefile
+++ b/glafp-utils/sgmlverb/Makefile
@@ -7,7 +7,8 @@ LIBS = $(FLEX_LIB)
 
 override SRC_FLEX_OPTS=-8
 
-CLEAN_FILES += sgmlverb.c
+# sgmlverb.c isn't in distclean
+MAINTAINER_CLEAN_FILES += sgmlverb.c
 
 #
 # For src distributions, include flex output.