diff --git a/regression/Makefile b/regression/Makefile
index 7c42bc92..6c011f92 100644
--- a/regression/Makefile
+++ b/regression/Makefile
@@ -58,7 +58,7 @@ endif
 
 ifeq ($(SUITE),UnittestSuite)
 PROJECT=freechips.rocketchip.unittest
-CONFIGS=TLSimpleUnitTestConfig TLWidthUnitTestConfig
+CONFIGS=AMBAUnitTestConfig TLSimpleUnitTestConfig TLWidthUnitTestConfig
 endif
 
 ifeq ($(SUITE), JtagDtmSuite)