diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 08ab910..b1613d5 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -89,26 +89,30 @@ jobs:
           cargo install x86-instruction-set-analyzer --version 0.1.0
           cargo build  # Build without RUSTFLAGS
 
+          echo "Running -C target_cpu=x86-64..."
+          echo
           export RUSTFLAGS="-C target_cpu=x86-64"
           target/debug/cargo-zigbuild zigbuild --manifest-path tests/target-cpu/Cargo.toml --target x86_64-unknown-linux-gnu --release
           x86-instruction-set-analyzer tests/target-cpu/target/x86_64-unknown-linux-gnu/release/target-cpu | tee output.txt
-          grep 'AVX2' output.txt &> /dev/null
-          if [ $? == 0 ]; then
-            echo "Test fail, should not contain AVX2 instruction set in target_cpu=x86-64"
+          echo
+          if grep -q 'AVX2' output.txt; then
+            echo "Test fail, should not contain AVX2 instruction set"
             false
           else
             echo "Test pass"
           fi
 
+          echo "Running -C target_cpu=x86-64-v4..."
+          echo
           export RUSTFLAGS="-C target_cpu=x86-64-v4"
           target/debug/cargo-zigbuild zigbuild --manifest-path tests/target-cpu/Cargo.toml --target x86_64-unknown-linux-gnu --release
           x86-instruction-set-analyzer tests/target-cpu/target/x86_64-unknown-linux-gnu/release/target-cpu | tee output.txt
-          grep 'AVX2' output.txt &> /dev/null
-          if [ $? = 0 ]; then
-            echo "Test pass"
-          else
-            echo "Test fail, should contain AVX2 instruction set in target_cpu=x86-64-v4"
+          echo
+          if ! grep -q 'AVX2' output.txt; then
+            echo "Test fail, should contain AVX2 instruction set"
             false
+          else
+            echo "Test pass"
           fi
       - name: macOS - Test build
         run: |