diff --git a/make-includes/standard_environment.make b/make-includes/standard_environment.make
index 5378c08..7297ee4 100755
--- a/make-includes/standard_environment.make
+++ b/make-includes/standard_environment.make
@@ -17,7 +17,11 @@
 DRAFT=
 #
 # Specify LaTeX document options (comma-separated list).
+# We need to add a comma if there is something there already!
 #
+ifdef LATEX_OPTS
+LATEX_OPTS+=,
+endif
 LATEX_OPTS+=pdftex,usepdftitle=false,$(DRAFT)
 #
 # List of standard "phony" build targets.