diff --git a/apps/plugins/rocklife.c b/apps/plugins/rocklife.c
index e039b451eb..8a1a1b35f2 100644
--- a/apps/plugins/rocklife.c
+++ b/apps/plugins/rocklife.c
@@ -129,7 +129,7 @@ void init_grid(char *pgrid){
 static bool load_cellfile(const char *file, char *pgrid){
     int fd;
     fd = rb->open(file, O_RDONLY);
-    if (fd==-1)
+    if (fd<0)
         return false;
         
     init_grid(pgrid);