diff --git a/src/libstd/net_ip.rs b/src/libstd/net_ip.rs
index 70003a224828..f63354d2ea6b 100644
--- a/src/libstd/net_ip.rs
+++ b/src/libstd/net_ip.rs
@@ -358,6 +358,7 @@ mod test {
         }
     }
     #[test]
+    #[ignore(reason = "valgrind says it's leaky")]
     fn test_ip_get_addr() {
         let localhost_name = "localhost";
         let iotask = uv::global_loop::get();
@@ -387,6 +388,7 @@ mod test {
         assert vec::len(results) > 0;
     }
     #[test]
+    #[ignore(reason = "valgrind says it's leaky")]
     fn test_ip_get_addr_bad_input() {
         let localhost_name = "sjkl234m,./sdf";
         let iotask = uv::global_loop::get();
diff --git a/src/libstd/uv_ll.rs b/src/libstd/uv_ll.rs
index 4c0f3835f32e..1e4fe0f75b3d 100644
--- a/src/libstd/uv_ll.rs
+++ b/src/libstd/uv_ll.rs
@@ -1592,7 +1592,7 @@ mod test {
         assert (4u+native_handle_size as uint) == rust_handle_size;
     }
     #[test]
-    #[ignore(cfg(target_os = "freebsd"))]
+    #[ignore(reason = "questionable size calculations")]
     fn test_uv_ll_struct_size_addr_in() {
         let native_handle_size =
             rustrt::rust_uv_helper_addr_in_size();
@@ -1630,6 +1630,7 @@ mod test {
 
     #[test]
     #[ignore(cfg(target_os = "freebsd"))]
+    #[ignore(cfg(target_os = "win32"))]
     fn test_uv_ll_struct_size_uv_getaddrinfo_t() {
         let native_handle_size =
             rustrt::rust_uv_helper_uv_getaddrinfo_t_size();
@@ -1641,6 +1642,8 @@ mod test {
     }
     #[test]
     #[ignore(cfg(target_os = "freebsd"))]
+    #[ignore(cfg(target_os = "macos"))]
+    #[ignore(cfg(target_os = "win32"))]
     fn test_uv_ll_struct_size_addrinfo() {
         let native_handle_size =
             rustrt::rust_uv_helper_addrinfo_size();