diff --git a/src/Makefile.am b/src/Makefile.am
index 75f780fa95..051222d9b3 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -81,8 +81,8 @@ curlx_hsrc = $(CURLX_HFILES)
 endif
 
 if USE_UNITY
-curltool_unity.c: $(top_srcdir)/scripts/mk-unity.pl $(CURL_CFILES) $(CURL_HFILES) $(curl_cfiles_gen) $(curl_hfiles_gen) $(curlx_csrc) $(curlx_hsrc)
-	@PERL@ $(top_srcdir)/scripts/mk-unity.pl --include $(CURL_CFILES) $(CURL_HFILES) $(curl_cfiles_gen) $(curl_hfiles_gen) $(curlx_csrc) $(curlx_hsrc) > curltool_unity.c
+curltool_unity.c: $(top_srcdir)/scripts/mk-unity.pl $(CURL_CFILES) $(curl_cfiles_gen) $(curlx_csrc)
+	@PERL@ $(top_srcdir)/scripts/mk-unity.pl --include $(CURL_CFILES) $(curl_cfiles_gen) $(curlx_csrc) > curltool_unity.c
 
 nodist_curl_SOURCES = curltool_unity.c
 curl_SOURCES =
@@ -112,8 +112,8 @@ libcurltool_la_CPPFLAGS = $(AM_CPPFLAGS) -DCURL_STATICLIB -DUNITTESTS
 libcurltool_la_CFLAGS =
 libcurltool_la_LDFLAGS = -static $(LIBCURL_PC_LIBS_PRIVATE)
 if USE_UNITY
-libcurltool_unity.c: $(top_srcdir)/scripts/mk-unity.pl $(CURL_CFILES) $(CURL_HFILES) $(curlx_csrc) $(curlx_hsrc)
-	@PERL@ $(top_srcdir)/scripts/mk-unity.pl --include $(CURL_CFILES) $(CURL_HFILES) $(curlx_csrc) $(curlx_hsrc) > libcurltool_unity.c
+libcurltool_unity.c: $(top_srcdir)/scripts/mk-unity.pl $(CURL_CFILES) $(curlx_csrc)
+	@PERL@ $(top_srcdir)/scripts/mk-unity.pl --include $(CURL_CFILES) $(curlx_csrc) > libcurltool_unity.c
 
 nodist_libcurltool_la_SOURCES = libcurltool_unity.c
 libcurltool_la_SOURCES =