diff --git a/src/slot.c b/src/slot.c
index 6a936028..fae892cc 100644
--- a/src/slot.c
+++ b/src/slot.c
@@ -246,7 +246,7 @@ void p11prov_slot_fork_prepare(P11PROV_SLOTS_CTX *sctx)
 {
     int err;
 
-    err = pthread_rwlock_wrlock(&sctx->rwlock);
+    err = pthread_rwlock_rdlock(&sctx->rwlock);
     if (err != 0) {
         err = errno;
         P11PROV_debug("Failed to get slots lock (errno:%d)", err);