diff --git a/src/jconf.c b/src/jconf.c
index 2a678458..f035db9d 100644
--- a/src/jconf.c
+++ b/src/jconf.c
@@ -76,8 +76,8 @@ jconf_t *read_jconf(const char* file)
     buf = malloc(pos + 1);
     if (buf == NULL) FATAL("No enough memory.");
 
-    int err = fread(buf, pos, 1, f);
-    if (err) FATAL("Failed to read the config file.");
+    int nread = fread(buf, pos, 1, f);
+    if (!nread) FATAL("Failed to read the config file.");
     fclose(f);
 
     buf[pos] = '\0'; // end of string