diff --git a/Cargo.lock b/Cargo.lock
index b0818bfef58..730a37d3ee2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -778,10 +778,10 @@ dependencies = [
 
 [[package]]
 name = "enum_primitive"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "num 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1188,7 +1188,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "enum_primitive 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "enum_primitive 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "gif 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "jpeg-decoder 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1790,16 +1790,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "nsstring_vendor"
 version = "0.1.0"
 
-[[package]]
-name = "num"
-version = "0.1.36"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "num-integer 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-iter 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "num-bigint"
 version = "0.1.35"
@@ -3450,7 +3440,7 @@ dependencies = [
 "checksum energymon-builder 0.3.0 (git+https://github.com/energymon/energymon-sys.git)" = "<none>"
 "checksum energymon-default-sys 0.3.0 (git+https://github.com/energymon/energymon-sys.git)" = "<none>"
 "checksum energymon-sys 0.3.0 (git+https://github.com/energymon/energymon-sys.git)" = "<none>"
-"checksum enum_primitive 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f79eff5be92a4d7d5bddf7daa7d650717ea71628634efe6ca7bcda85b2183c23"
+"checksum enum_primitive 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "be4551092f4d519593039259a9ed8daedf0da12e5109c5280338073eaeb81180"
 "checksum env_logger 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "99971fb1b635fe7a0ee3c4d065845bb93cca80a23b5613b5613391ece5de4144"
 "checksum euclid 0.10.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0c274f13773ec277a48408d0c7a8dc935ad4bfe190f4cfccd0126d203afc3c83"
 "checksum expat-sys 2.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "cef36cd1a8a02d28b91d97347c63247b9e4cb8a8e36df36f8201dc87a1c0859c"
@@ -3520,7 +3510,6 @@ dependencies = [
 "checksum nix 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "bfb3ddedaa14746434a02041940495bf11325c22f6d36125d3bdd56090d50a79"
 "checksum nodrop 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "0dbbadd3f4c98dea0bd3d9b4be4c0cdaf1ab57035cb2e41fce3983db5add7cc5"
 "checksum nom 1.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a5b8c256fd9471521bcb84c3cdba98921497f1a331cbc15b8030fc63b82050ce"
-"checksum num 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)" = "bde7c03b09e7c6a301ee81f6ddf66d7a28ec305699e3d3b056d2fc56470e3120"
 "checksum num-bigint 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)" = "88b14378471f7c2adc5262f05b4701ef53e8da376453a8d8fee48e51db745e49"
 "checksum num-integer 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)" = "fb24d9bfb3f222010df27995441ded1e954f8f69cd35021f6bef02ca9552fb92"
 "checksum num-iter 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)" = "287a1c9969a847055e1122ec0ea7a5c5d6f72aad97934e131c83d5c08ab4e45c"
diff --git a/servo-tidy.toml b/servo-tidy.toml
index 92ab924185f..9f6c24fae21 100644
--- a/servo-tidy.toml
+++ b/servo-tidy.toml
@@ -27,6 +27,7 @@ rand = [
   "websocket",
   "ws",
 ]
+num = []
 
 [ignore]
 # Ignored packages with duplicated versions