1 files changed, 1 insertions, 1 deletions
diff --git a/src/or/routerparse.c b/src/or/routerparse.c
index c54097782e..c12d07f613 100644
--- a/src/or/routerparse.c
+++ b/src/or/routerparse.c
@@ -214,7 +214,7 @@ get_recommended_software_from_directory(const char *str)
     comma = strchr(vl, ',');
     version = tor_strndup(vl, comma?(comma-vl):strlen(vl));
     cp = version;
-    while (isspace(*cp))
+    while (isspace((int)*cp))
       ++cp;
     if (!strncmp(cp, "Tor ", 4))
       cp += 4;