2 files changed, 9 insertions, 9 deletions
diff --git a/ext/json/ext/parser/parser.c b/ext/json/ext/parser/parser.c
index 8824b30..20531b3 100644
--- a/ext/json/ext/parser/parser.c
+++ b/ext/json/ext/parser/parser.c
@@ -28,16 +28,16 @@ static UTF32 unescape_unicode(const unsigned char *p)
     UTF32 result = 0;
     b = digit_values[p[0]];
     if (b < 0) return UNI_REPLACEMENT_CHAR;
-    result = (result << 4) | b;
+    result = (result << 4) | (unsigned char)b;
     b = digit_values[p[1]];
-    result = (result << 4) | b;
     if (b < 0) return UNI_REPLACEMENT_CHAR;
+    result = (result << 4) | (unsigned char)b;
     b = digit_values[p[2]];
-    result = (result << 4) | b;
     if (b < 0) return UNI_REPLACEMENT_CHAR;
+    result = (result << 4) | (unsigned char)b;
     b = digit_values[p[3]];
-    result = (result << 4) | b;
     if (b < 0) return UNI_REPLACEMENT_CHAR;
+    result = (result << 4) | (unsigned char)b;
     return result;
 }
 
diff --git a/ext/json/ext/parser/parser.rl b/ext/json/ext/parser/parser.rl
index 2af1cc6..70f3f9a 100644
--- a/ext/json/ext/parser/parser.rl
+++ b/ext/json/ext/parser/parser.rl
@@ -26,16 +26,16 @@ static UTF32 unescape_unicode(const unsigned char *p)
     UTF32 result = 0;
     b = digit_values[p[0]];
     if (b < 0) return UNI_REPLACEMENT_CHAR;
-    result = (result << 4) | b;
+    result = (result << 4) | (unsigned char)b;
     b = digit_values[p[1]];
-    result = (result << 4) | b;
     if (b < 0) return UNI_REPLACEMENT_CHAR;
+    result = (result << 4) | (unsigned char)b;
     b = digit_values[p[2]];
-    result = (result << 4) | b;
     if (b < 0) return UNI_REPLACEMENT_CHAR;
+    result = (result << 4) | (unsigned char)b;
     b = digit_values[p[3]];
-    result = (result << 4) | b;
     if (b < 0) return UNI_REPLACEMENT_CHAR;
+    result = (result << 4) | (unsigned char)b;
     return result;
 }
 
@@ -887,7 +887,7 @@ static VALUE cParser_quirks_mode_p(VALUE self)
 }
 
 
-void Init_parser()
+void Init_parser(void)
 {
     rb_require("json/common");
     mJSON = rb_define_module("JSON");