diff --git a/Cantera/src/thermo/Makefile.in b/Cantera/src/thermo/Makefile.in
index e6d1d657c..a2e79fe2c 100644
--- a/Cantera/src/thermo/Makefile.in
+++ b/Cantera/src/thermo/Makefile.in
@@ -70,7 +70,7 @@ ifeq ($(do_ranlib),1)
 endif
 
 clean:
-	@(for lh in $(CATHERMO_H) ; do \
+	@(for lh in dummy.h $(CATHERMO_H) ; do \
             th=$(INCDIR)/"$${lh}" ; \
 	    if test -f "$${th}" ; then \
 	      $(RM) "$${th}"  ; \