diff --git a/Makefile.in b/Makefile.in
index 9e23ddaaf..fbbc84847 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -257,6 +257,7 @@ parse.cc: $(srcdir)/parse.y
 	$(YACC) --verbose -t -p VL -d -o $@ $<
 parse.h: parse.cc
 	mv parse.cc.h $@ 2>/dev/null || mv parse.hh $@
+	touch $@
 
 syn-rules.cc: $(srcdir)/syn-rules.y
 	$(YACC) --verbose -t -p syn_ -o $@ $<
diff --git a/tgt-pcb/Makefile.in b/tgt-pcb/Makefile.in
index 9049f38fd..228ede553 100644
--- a/tgt-pcb/Makefile.in
+++ b/tgt-pcb/Makefile.in
@@ -91,6 +91,7 @@ fp.cc: $(srcdir)/fp.y
 	$(YACC) --verbose -t -p fp -d -o $@ $<
 fp.h: fp.cc
 	mv fp.cc.h $@ 2>/dev/null || mv fp.hh $@
+	touch $@
 
 ifeq (@WIN32@,yes)
   TGTLDFLAGS=-L.. -livl
diff --git a/vhdlpp/Makefile.in b/vhdlpp/Makefile.in
index 0a0f264d2..9bafaf100 100644
--- a/vhdlpp/Makefile.in
+++ b/vhdlpp/Makefile.in
@@ -120,6 +120,7 @@ parse.cc: $(srcdir)/parse.y
 	$(YACC) --verbose -t -d -o $@ $<
 parse.h: parse.cc
 	mv parse.cc.h $@ 2>/dev/null || mv parse.hh $@
+	touch $@
 
 lexor_keyword.o: lexor_keyword.cc parse.h
 
diff --git a/vvp/Makefile.in b/vvp/Makefile.in
index df5fcb6bd..2ff89aef2 100644
--- a/vvp/Makefile.in
+++ b/vvp/Makefile.in
@@ -168,6 +168,7 @@ parse.cc: $(srcdir)/parse.y
 	$(YACC) --verbose -t -d -o $@ $<
 parse.h: parse.cc
 	mv parse.cc.h $@ 2>/dev/null || mv parse.hh $@
+	touch $@
 
 lexor.cc: $(srcdir)/lexor.lex
 	$(LEX) -s -olexor.cc $(srcdir)/lexor.lex