diff --git a/.github/workflows/keccak.yml b/.github/workflows/keccak.yml
index 1d49ae5..73f6068 100644
--- a/.github/workflows/keccak.yml
+++ b/.github/workflows/keccak.yml
@@ -84,7 +84,7 @@ jobs:
       - run: cargo test --target ${{ matrix.target }} --features parallel
       - run: cargo test --release --target ${{ matrix.target }} --features parallel
       - env:
-          RUSTFLAGS: '-Dwarnings --cfg keccak_soft_compact'
+          RUSTFLAGS: '-Dwarnings --cfg keccak_backend_soft="compact"'
         run: cargo test --release --target ${{ matrix.target }}
       - env:
           RUSTFLAGS: '-Dwarnings --cfg keccak_backend="soft"'
@@ -131,7 +131,7 @@ jobs:
       - run: cargo miri test --target ${{ matrix.target }}
       - run: cargo miri test --target ${{ matrix.target }} --features parallel
       - env:
-          RUSTFLAGS: '-Dwarnings --cfg keccak_soft_compact'
+          RUSTFLAGS: '-Dwarnings --cfg keccak_backend_soft="compact"'
         run: cargo miri test --release --target ${{ matrix.target }} --features parallel
       - env:
           RUSTFLAGS: '-Dwarnings --cfg keccak_backend="simd128"'
diff --git a/keccak/Cargo.toml b/keccak/Cargo.toml
index d5d6550..948ea16 100644
--- a/keccak/Cargo.toml
+++ b/keccak/Cargo.toml
@@ -33,7 +33,7 @@ unused_qualifications = "warn"
 [lints.rust.unexpected_cfgs]
 level = "warn"
 check-cfg = [
-    'cfg(keccak_soft_compact)',
+    'cfg(keccak_backend_soft, values("compact"))',
     'cfg(keccak_backend, values("aarch64_sha3", "simd128", "simd256", "simd512", "soft"))',
 ]
 
diff --git a/keccak/src/backends/soft.rs b/keccak/src/backends/soft.rs
index 11b6fde..f3ad673 100644
--- a/keccak/src/backends/soft.rs
+++ b/keccak/src/backends/soft.rs
@@ -52,7 +52,7 @@ impl_lanesize!(u64, F1600_ROUNDS);
 #[rustfmt::skip]
 macro_rules! unroll5 {
     ($var: ident, $body: block) => {
-        #[cfg(not(keccak_soft_compact))]
+        #[cfg(not(keccak_backend_soft = "compact"))]
         {
             { const $var: usize = 0; $body; }
             { const $var: usize = 1; $body; }
@@ -60,7 +60,7 @@ macro_rules! unroll5 {
             { const $var: usize = 3; $body; }
             { const $var: usize = 4; $body; }
         }
-        #[cfg(keccak_soft_compact)]
+        #[cfg(keccak_backend_soft = "compact")]
         {
             for $var in 0..5 $body
         }
@@ -70,7 +70,7 @@ macro_rules! unroll5 {
 #[rustfmt::skip]
 macro_rules! unroll24 {
     ($var: ident, $body: block) => {
-        #[cfg(not(keccak_soft_compact))]
+        #[cfg(not(keccak_backend_soft = "compact"))]
         {
             { const $var: usize = 0; $body; }
             { const $var: usize = 1; $body; }
@@ -97,7 +97,7 @@ macro_rules! unroll24 {
             { const $var: usize = 22; $body; }
             { const $var: usize = 23; $body; }
         }
-        #[cfg(keccak_soft_compact)]
+        #[cfg(keccak_backend_soft = "compact")]
         {
             for $var in 0..24 $body
         }