diff --git a/tests/scripts/basic-build-test.sh b/tests/scripts/basic-build-test.sh
index 06c2eb9bd..f1b36c379 100755
--- a/tests/scripts/basic-build-test.sh
+++ b/tests/scripts/basic-build-test.sh
@@ -36,7 +36,8 @@ fi
 
 
 # Step 1 - Make and instrumented build for code coverage
-CFLAGS=' --coverage -g3 -O0 '
+export CFLAGS=' --coverage -g3 -O0 '
+make clean
 make