diff --git a/make/tex.mk b/make/tex.mk
index 56bb18c6..3b37a7e8 100644
--- a/make/tex.mk
+++ b/make/tex.mk
@@ -27,7 +27,7 @@ PRE_HTML_REMOTE = $(foreach dir,$(TEX_TMPL_DIR),$(wildcard $(dir)/*.html))
 FILES_FROM_TMPL = $(notdir $(patsubst %.ger,%.tex,$(patsubst %.tmpl,%,$(PRE_TMPL_REMOTE) $(PRE_TMPL_LOCAL))))
 EPS_FROM_FIG    = $(notdir $(patsubst %.fig,%.png,$(PRE_FIG_REMOTE) $(PRE_FIG_LOCAL)))
 FILES_COPIED    = $(notdir $(wildcard $(TEX_TMPL_DIR)/*.html $(TEX_TMPL_DIR)/*.tex))
-GENERATED = $(FILES_FROM_TMPL) $(EPS_FROM_FIG) $(FILES_COPIED)
+GENERATED += $(FILES_FROM_TMPL) $(EPS_FROM_FIG) $(FILES_COPIED)
 GENERATED_TEX = $(filter %.tex,$(GENERATED))
 GENERATED_EPS = $(filter %.png,$(GENERATED))
 GENERATED_HTML = $(filter %.html,$(GENERATED))