diff --git a/src/Routes/RouteRegister.c b/src/Routes/RouteRegister.c
index d23e3f2..838a989 100644
--- a/src/Routes/RouteRegister.c
+++ b/src/Routes/RouteRegister.c
@@ -47,7 +47,7 @@ ROUTE_IMPL(RouteRegister, args)
     char *initialDeviceDisplayName = NULL;
     int refreshToken = 0;
     int inhibitLogin = 0;
-    char *deviceId;
+    char *deviceId = NULL;
 
     if (MATRIX_PATH_PARTS(args->path) == 0)
     {