1 files changed, 1 insertions, 1 deletions

diff --git a/gzio.c b/gzio.c
index 1beb47f..f10ade3 100644
--- a/gzio.c
+++ b/gzio.c
@@ -608,7 +608,7 @@ int ZEXPORTVA gzprintf (gzFile file, const char *format, /* args */ ...)
     va_end(va);
 #  endif
 #endif
-    if (len <= 0 || len >= sizeof(buf) || buf[sizeof(buf) - 1] != 0)
+    if (len <= 0 || len >= (int)sizeof(buf) || buf[sizeof(buf) - 1] != 0)
         return 0;
     return gzwrite(file, buf, (unsigned)len);
 }