diff --git a/.github/workflows/pathogen-repo-build.yaml b/.github/workflows/pathogen-repo-build.yaml
index 1872d55..c6b2da1 100644
--- a/.github/workflows/pathogen-repo-build.yaml
+++ b/.github/workflows/pathogen-repo-build.yaml
@@ -267,6 +267,8 @@ jobs:
         with:
           cli-version: ">=7.4.0"
           runtime: ${{ inputs.runtime }}
+      - name: Install expect for unbuffer
+        run: sudo apt-get install expect
       - name: Run build via ${{ inputs.runtime }}
         env:
           NEXTSTRAIN_BUILD_COMMAND: ${{ inputs.run }}
@@ -274,7 +276,7 @@ jobs:
           # shellcheck disable=SC2154
           set -x
 
-          eval "$NEXTSTRAIN_BUILD_COMMAND" |& tee build.log
+          eval "unbuffer $NEXTSTRAIN_BUILD_COMMAND" |& tee build.log
       # Attempt to get the AWS Batch ID even if the run build command failed
       # as long as the runtime is `aws-batch` and the `build.log` file exists
       - if: ${{ always() && inputs.runtime == 'aws-batch' && hashFiles('build.log') != '' }}
diff --git a/.github/workflows/pathogen-repo-build.yaml.in b/.github/workflows/pathogen-repo-build.yaml.in
index 5157cdf..54f548a 100644
--- a/.github/workflows/pathogen-repo-build.yaml.in
+++ b/.github/workflows/pathogen-repo-build.yaml.in
@@ -233,6 +233,9 @@ jobs:
           cli-version: ">=7.4.0"
           runtime: ${{ inputs.runtime }}
 
+      - name: Install expect for unbuffer
+        run: sudo apt-get install expect
+
       - name: Run build via ${{ inputs.runtime }}
         env:
           NEXTSTRAIN_BUILD_COMMAND: ${{ inputs.run }}
@@ -240,7 +243,7 @@ jobs:
           # shellcheck disable=SC2154
           set -x
 
-          eval "$NEXTSTRAIN_BUILD_COMMAND" |& tee build.log
+          eval "unbuffer $NEXTSTRAIN_BUILD_COMMAND" |& tee build.log
 
       # Attempt to get the AWS Batch ID even if the run build command failed
       # as long as the runtime is `aws-batch` and the `build.log` file exists