diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index fdeb90d..300a7ba 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -18,6 +18,8 @@ jobs:
       run: cargo build --verbose --release --all
     - name: Run tests
       run: cargo test --verbose --release --all
+    - name: Run slow tests
+      run: cargo test --verbose --release --all -- --ignored
 
   macOS:
     name: Test on macOS-latest
@@ -35,3 +37,5 @@ jobs:
       run: $HOME/.cargo/bin/cargo build --verbose --release --all
     - name: Run tests
       run: $HOME/.cargo/bin/cargo test --verbose --release --all
+    - name: Run slow tests
+      run: $HOME/.cargo/bin/cargo test --verbose --release --all -- --ignored
diff --git a/.travis.yml b/.travis.yml
index b9fcb7e..e976cd0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,6 +17,7 @@ script:
   - cargo fmt --all -- --check
   - cargo build --verbose --release --all
   - cargo test --verbose --release --all
+  - cargo test --verbose --release --all -- --ignored
 
 before_cache:
   - rm -rf "$TRAVIS_HOME/.cargo/registry/src"
diff --git a/zcash_proofs/src/circuit/sprout/mod.rs b/zcash_proofs/src/circuit/sprout/mod.rs
index 358e1bb..b946464 100644
--- a/zcash_proofs/src/circuit/sprout/mod.rs
+++ b/zcash_proofs/src/circuit/sprout/mod.rs
@@ -326,6 +326,7 @@ where
 }
 
 #[test]
+#[ignore]
 fn test_sprout_constraints() {
     use bellman::gadgets::test::*;
     use pairing::bls12_381::Bls12;