diff --git a/src/exchange/test_taler_exchange_httpd.conf b/src/exchange/test_taler_exchange_httpd.conf
index fc9f389b0..1c2372d8b 100644
--- a/src/exchange/test_taler_exchange_httpd.conf
+++ b/src/exchange/test_taler_exchange_httpd.conf
@@ -1,6 +1,7 @@
 [PATHS]
 # Persistent data storage for the testcase
 TALER_TEST_HOME = test_taler_exchange_httpd_home/
+TALER_RUNTIME_DIR = ${TMPDIR:-${TMP:-/tmp}}/${USER:-}/taler-system-runtime/
 
 [taler]
 # Currency supported by the exchange (can only be one)
diff --git a/src/exchange/test_taler_exchange_unix.conf b/src/exchange/test_taler_exchange_unix.conf
index 88cc96fa1..b795794d2 100644
--- a/src/exchange/test_taler_exchange_unix.conf
+++ b/src/exchange/test_taler_exchange_unix.conf
@@ -1,6 +1,7 @@
 [PATHS]
 # Persistent data storage for the testcase
 TALER_TEST_HOME = test_taler_exchange_httpd_home/
+TALER_RUNTIME_DIR = ${TMPDIR:-${TMP:-/tmp}}/${USER:-}/taler-system-runtime/
 
 [taler]
 # Currency supported by the exchange (can only be one)
diff --git a/src/testing/test-taler-exchange-aggregator-postgres.conf b/src/testing/test-taler-exchange-aggregator-postgres.conf
index 506cf4e8c..2c03c5db7 100644
--- a/src/testing/test-taler-exchange-aggregator-postgres.conf
+++ b/src/testing/test-taler-exchange-aggregator-postgres.conf
@@ -1,6 +1,7 @@
 [PATHS]
 # Persistent data storage for the testcase
 TALER_TEST_HOME = test_taler_exchange_httpd_home/
+TALER_RUNTIME_DIR = ${TMPDIR:-${TMP:-/tmp}}/${USER:-}/taler-system-runtime/
 
 [taler-exchange-secmod-rsa]
 # Reduce from 1 year to speed up test
diff --git a/src/testing/test-taler-exchange-wirewatch-postgres.conf b/src/testing/test-taler-exchange-wirewatch-postgres.conf
index d86be184b..6a9639897 100644
--- a/src/testing/test-taler-exchange-wirewatch-postgres.conf
+++ b/src/testing/test-taler-exchange-wirewatch-postgres.conf
@@ -1,6 +1,7 @@
 [PATHS]
 # Persistent data storage for the testcase
 TALER_TEST_HOME = test_taler_exchange_httpd_home/
+TALER_RUNTIME_DIR = ${TMPDIR:-${TMP:-/tmp}}/${USER:-}/taler-system-runtime/
 
 [taler-exchange-secmod-rsa]
 # Reduce from 1 year to speed up test
diff --git a/src/testing/test_auditor_api.conf b/src/testing/test_auditor_api.conf
index 641a5f763..4140aeb42 100644
--- a/src/testing/test_auditor_api.conf
+++ b/src/testing/test_auditor_api.conf
@@ -4,6 +4,7 @@
 [PATHS]
 # Persistent data storage for the testcase
 TALER_TEST_HOME = test_exchange_api_home/
+TALER_RUNTIME_DIR = ${TMPDIR:-${TMP:-/tmp}}/${USER:-}/taler-system-runtime/
 
 [taler-exchange-secmod-rsa]
 # Reduce from 1 year to speed up test
diff --git a/src/testing/test_exchange_api.conf b/src/testing/test_exchange_api.conf
index a0a28e246..edead6beb 100644
--- a/src/testing/test_exchange_api.conf
+++ b/src/testing/test_exchange_api.conf
@@ -4,6 +4,7 @@
 [PATHS]
 # Persistent data storage for the testcase
 TALER_TEST_HOME = test_exchange_api_home/
+TALER_RUNTIME_DIR = ${TMPDIR:-${TMP:-/tmp}}/${USER:-}/taler-system-runtime/
 
 [taler-exchange-secmod-rsa]
 # Reduce from 1 year to speed up test
diff --git a/src/testing/test_exchange_api_keys_cherry_picking.conf b/src/testing/test_exchange_api_keys_cherry_picking.conf
index 32d9ac76f..e7a56f3c7 100644
--- a/src/testing/test_exchange_api_keys_cherry_picking.conf
+++ b/src/testing/test_exchange_api_keys_cherry_picking.conf
@@ -3,6 +3,7 @@
 [PATHS]
 # Persistent data storage for the testcase
 TALER_TEST_HOME = test_exchange_api_keys_cherry_picking_home/
+TALER_RUNTIME_DIR = ${TMPDIR:-${TMP:-/tmp}}/${USER:-}/taler-system-runtime/
 
 # Persistent data storage
 TALER_DATA_HOME = $TALER_HOME/.local/share/taler/
diff --git a/src/testing/test_exchange_api_twisted.conf b/src/testing/test_exchange_api_twisted.conf
index 26c8bc485..2d4fc517b 100644
--- a/src/testing/test_exchange_api_twisted.conf
+++ b/src/testing/test_exchange_api_twisted.conf
@@ -2,6 +2,7 @@
 [PATHS]
 # Persistent data storage for the testcase
 TALER_TEST_HOME = test_exchange_api_home/
+TALER_RUNTIME_DIR = ${TMPDIR:-${TMP:-/tmp}}/${USER:-}/taler-system-runtime/
 
 [taler-exchange-secmod-rsa]
 # Reduce from 1 year to speed up test