diff --git a/src/util/test_helper_eddsa.conf b/src/util/test_helper_eddsa.conf
index f98bff962..de2231cb3 100644
--- a/src/util/test_helper_eddsa.conf
+++ b/src/util/test_helper_eddsa.conf
@@ -1,6 +1,7 @@
 [PATHS]
 # Persistent data storage for the testcase
 TALER_TEST_HOME = test_helper_eddsa_home/
+TALER_RUNTIME_DIR = test_helper_eddsa_home/tmp/
 
 [taler-helper-crypto-eddsa]
 LOOKAHEAD_SIGN = 5 minutes
diff --git a/src/util/test_helper_rsa.conf b/src/util/test_helper_rsa.conf
index cfd3b3013..c02b08a32 100644
--- a/src/util/test_helper_rsa.conf
+++ b/src/util/test_helper_rsa.conf
@@ -1,6 +1,7 @@
 [PATHS]
 # Persistent data storage for the testcase
 TALER_TEST_HOME = test_helper_rsa_home/
+TALER_RUNTIME_DIR = test_helper_eddsa_home/tmp/
 
 
 [coin_1]