diff --git a/configuration/configure.ac b/configuration/configure.ac
index 4f7dc88..8938388 100644
--- a/configuration/configure.ac
+++ b/configuration/configure.ac
@@ -158,7 +158,7 @@
 AC_MSG_CHECKING([for PlantUML])
 AS_IF([$PLANTUML_AVAILABLE],
 	  [AC_SUBST([PLANTUML],
-	  ["${JAVA} -jar ${PLANTUML_JAR}"])
+	  ["${JAVA} -Djava.awt.headless=true -jar ${PLANTUML_JAR}"])
 AC_MSG_RESULT([$PLANTUML])],
 [	AC_MSG_RESULT([no])
 	AC_MSG_ERROR([could not find PlantUML])])