diff --git a/Jenkinsfile b/Jenkinsfile
index 1adfd73..276e23b 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -85,7 +85,10 @@ pipeline {
                       "$IMAGEFIND_DEPENDENCY_TMPDIR" "$IMAGEFIND_VERIFY_TMPDIR" artifacts
                     chmod 700 "$DOCKER_CONFIG"
                     available_kb=$(df -Pk "$WORKSPACE" | awk 'NR == 2 { print $4 }')
-                    test "$available_kb" -ge 4194304
+                    test "$available_kb" -ge 3145728 || {
+                      printf 'at least 3 GiB free disk space is required; available: %s KiB\n' "$available_kb" >&2
+                      exit 1
+                    }
                 '''
             }
         }