diff --git a/regression_test/templateConcat/Makefile b/regression_test/templateConcat/Makefile
index aff3b4f3286d726a456cab63facc3ff5573ca195..966b6e8e9eeb6eab30af7ba1de710952c6b40620 100644
--- a/regression_test/templateConcat/Makefile
+++ b/regression_test/templateConcat/Makefile
@@ -12,6 +12,11 @@
 TOPDIR := ..
 include $(TOPDIR)/Makefile.regression
 
+#only works with RT2
+ifndef RT2
+$(error note: templateConcat requires RT2)
+endif
+
 .SUFFIXES: .ttcn .asn .hh
 .PHONY: all clean dep run