diff --git a/tests/run_unitTests.R b/tests/run_unitTests.R
index b8992944..741c2c7e 100644
--- a/tests/run_unitTests.R
+++ b/tests/run_unitTests.R
@@ -1,2 +1,3 @@
 require("IRanges") || stop("unable to load IRanges package")
+require("RUnit") || stop("unable to load RUnit package")
 IRanges:::.test()