diff --git a/src/util/taler-helper-crypto-eddsa.conf b/src/util/taler-helper-crypto-eddsa.conf
index 6be9947e6..a1f42ca4e 100644
--- a/src/util/taler-helper-crypto-eddsa.conf
+++ b/src/util/taler-helper-crypto-eddsa.conf
@@ -18,3 +18,6 @@ SM_PRIV_KEY = ${TALER_DATA_HOME}/taler-helper-crypto-eddsa/.private-key
 
 # For how long into the future do we pre-generate keys?
 LOOKAHEAD_SIGN = 1 year
+
+# For how long are signing keys valid?
+DURATION = 3 months