diff --git a/ext/fast_xs/fast_xs.c b/ext/fast_xs/fast_xs.c
index 11ef71f..d5eb8d8 100644
--- a/ext/fast_xs/fast_xs.c
+++ b/ext/fast_xs/fast_xs.c
@@ -144,7 +144,7 @@ static VALUE unpack_utf8(VALUE self)
 	return rb_funcall(self, unpack_id, 1, U_fmt);
 }
 
-static VALUE unpack_uchar(VALUE self)
+static VALUE unpack_uchar(VALUE self, VALUE _exn)
 {
 	return rb_funcall(self, unpack_id, 1, C_fmt);
 }
diff --git a/ext/hpricot_scan/hpricot_scan.c b/ext/hpricot_scan/hpricot_scan.c
index f11cbb5..161ebd4 100644
--- a/ext/hpricot_scan/hpricot_scan.c
+++ b/ext/hpricot_scan/hpricot_scan.c
@@ -22,7 +22,7 @@ struct hpricot_struct {
 #define RSTRING_PTR(str) RSTRING(str)->ptr
 #endif
 
-VALUE hpricot_css(VALUE, VALUE, VALUE, VALUE, VALUE);
+VALUE hpricot_css(VALUE, VALUE, VALUE, VALUE);
 
 #define NO_WAY_SERIOUSLY "*** This should not happen, please file a bug report with the HTML you're parsing at http://github.com/hpricot/hpricot/issues.  So sorry!"
 
diff --git a/ext/hpricot_scan/hpricot_scan.rl b/ext/hpricot_scan/hpricot_scan.rl
index 0f17f11..8b00a38 100644
--- a/ext/hpricot_scan/hpricot_scan.rl
+++ b/ext/hpricot_scan/hpricot_scan.rl
@@ -20,7 +20,7 @@ struct hpricot_struct {
 #define RSTRING_PTR(str) RSTRING(str)->ptr
 #endif
 
-VALUE hpricot_css(VALUE, VALUE, VALUE, VALUE, VALUE);
+VALUE hpricot_css(VALUE, VALUE, VALUE, VALUE);
 
 #define NO_WAY_SERIOUSLY "*** This should not happen, please file a bug report with the HTML you're parsing at http://github.com/hpricot/hpricot/issues.  So sorry!"
 
@@ -806,7 +806,7 @@ make_hpricot_struct(VALUE members, VALUE (*alloc)(VALUE klass))
   for (i = 0; i < len; i++) {
     ID id = SYM2ID(rb_ary_entry(members, i));
     const char* name = rb_id2name(id);
-    int len = strlen(name);
+    size_t len = strlen(name);
 
     memcpy(attr_set, name, strlen(name));
     attr_set[len] = '=';