diff --git a/src/evm.c b/src/evm.c
index 6aa82ac..819fa61 100644
--- a/src/evm.c
+++ b/src/evm.c
@@ -155,8 +155,8 @@ int evrsrm_recv(EV_RSR_t *evrsr_request) {
     uint8_t fi_oer[1024];
     tr_oer[0] = 4;  // Facilities
     fi_oer[0] = 4;
-    if (!evrsr_request->messageBody.present == EV_RSR_MessageBody_PR_preReservationRequestMessage ||
-        !evrsr_request->messageBody.present == EV_RSR_MessageBody_PR_reservationRequestMessage) {
+    if (!(evrsr_request->messageBody.present == EV_RSR_MessageBody_PR_preReservationRequestMessage ||
+        evrsr_request->messageBody.present == EV_RSR_MessageBody_PR_reservationRequestMessage)) {
         rv = 1;
         goto cleanup;
     }