diff --git a/src/Makefile.am b/src/Makefile.am
index 633e993bf..32c6f1b79 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -277,8 +277,7 @@ $(srcdir)/%.hh: $(srcdir)/%.rl
 
 harfbuzz.cc: Makefile.sources
 	$(AM_V_GEN) \
-	$(srcdir)/gen-harfbuzzcc.py \
-		$(srcdir)/harfbuzz.cc \
+	$(srcdir)/gen-harfbuzzcc.py harfbuzz.cc \
 		$(HB_BASE_sources) \
 		$(HB_GLIB_sources) \
 		$(HB_FT_sources) \