diff --git src/shared/util.c src/shared/util.c
index 9983695..0de954f 100644
--- src/shared/util.c
+++ src/shared/util.c
@@ -3801,7 +3801,7 @@ int fd_columns(int fd) {
 
 unsigned columns(void) {
         const char *e;
-        unsigned c;
+        int c;
 
         if (_likely_(cached_columns > 0))
                 return cached_columns;