1 files changed, 1 insertions, 1 deletions
diff --git a/configure.in b/configure.in
index 415aae9d23..d046257ae6 100644
--- a/configure.in
+++ b/configure.in
@@ -260,7 +260,7 @@ AC_CACHE_CHECK(whether right shift preserve sign bit, rb_cv_rshift_sign,
 int
 main()
 {
-  if (-1==(-1>>1))
+  if (-1==(-1>>(unsigned)1))
     return 0;
   return 1;
 }