diff --git a/tests/bin/setup-env.in b/tests/bin/setup-env.in
index 17b793c72..a84848285 100644
--- a/tests/bin/setup-env.in
+++ b/tests/bin/setup-env.in
@@ -1,5 +1,8 @@
 #!/bin/sh
 
+unset KRB5_CONFIG
+unset KRB5CCNAME
+
 top_builddir="@top_builddir@"
 top_srcdir="@top_srcdir@"
 EGREP="@EGREP@"