diff --git a/test/interpdef1.ivy b/test/interpdef1.ivy
new file mode 100644
index 00000000..d988ceaf
--- /dev/null
+++ b/test/interpdef1.ivy
@@ -0,0 +1,7 @@
+#lang ivy1.7
+type nat
+interpret nat->nat
+relation (N:nat < N:nat)
+definition (N:nat < N1) = true
+invariant X:nat<X
+invariant false
diff --git a/test/run_expects.py b/test/run_expects.py
index b6089a8d..53a8da30 100644
--- a/test/run_expects.py
+++ b/test/run_expects.py
@@ -15,6 +15,7 @@
 checks = [
     ['.',
       [
+          ['interpdef1','interpdef1.ivy: line 5: error: definition of interpreted symbol <'],
           ['whileexists1','OK'],
           ['whilesome1','OK'],
           ['whilesome2','OK'],