diff --git a/src/AcquiaPlatformCdn/FastlyBackend.php b/src/AcquiaPlatformCdn/FastlyBackend.php
index deb73a7..0847bf8 100644
--- a/src/AcquiaPlatformCdn/FastlyBackend.php
+++ b/src/AcquiaPlatformCdn/FastlyBackend.php
@@ -241,6 +241,9 @@ class FastlyBackend extends BackendBase implements BackendInterface {
     $opt['headers']['Accept'] = 'application/json';
     $opt['headers']['Fastly-Key'] = $this->token;
     $opt['headers']['User-Agent'] = 'Acquia Purge';
+    // Soft purge (Fastly feature).
+    $opt['headers']['Fastly-Soft-Purge'] = 1;
+
     // Trigger the debugging middleware when Purge's debug mode is enabled.
     if ($this->debugger()->enabled()) {
       $opt['acquia_purge_debugger'] = $this->debugger();