diff --git a/nimble/host/src/ble_gap.c b/nimble/host/src/ble_gap.c
index ed713748a..9d7d0f018 100644
--- a/nimble/host/src/ble_gap.c
+++ b/nimble/host/src/ble_gap.c
@@ -2384,6 +2384,12 @@ ble_gap_connect(uint8_t own_addr_type, const ble_addr_t *peer_addr,
         goto done;
     }
 
+    /* Verify peer not already connected. */
+    if (ble_hs_conn_find_by_addr(peer_addr) != NULL) {
+        rc = BLE_HS_EDONE;
+        goto done;
+    }
+
     if (!ble_hs_conn_can_alloc()) {
         rc = BLE_HS_ENOMEM;
         goto done;