diff --git a/src/engine.rs b/src/engine.rs
index 5b03852f..47e19fed 100644
--- a/src/engine.rs
+++ b/src/engine.rs
@@ -30,6 +30,7 @@ use crossbeam_queue::{ArrayQueue, SegQueue};
 use crossbeam_utils::thread;
 use log::{debug, error, info, warn};
 use rpki::crypto::keys::KeyIdentifier;
+#[allow(unused_imports)]
 use rpki::repository::aspa::{Aspa, AsProviderAttestation};
 use rpki::repository::cert::{Cert, KeyUsage, ResourceCert};
 use rpki::repository::crl::Crl;
@@ -1390,32 +1391,35 @@ impl<'a, P: ProcessRun> PubPoint<'a, P> {
     }
 
     /// Process an ASPA object.
+    #[allow(unused_variables)]
     fn process_aspa(
         &mut self, uri: &uri::Rsync, content: Bytes,
         manifest: &mut ValidPointManifest,
     ) -> Result<(), Failed> {
-        let aspa = match Aspa::decode(
-            content, self.run.validation.strict
-        ) {
-            Ok(aspa) => aspa,
-            Err(err) => {
-                warn!("{}: {}.", uri, err);
-                manifest.metrics.invalid_aspas += 1;
-                return Ok(())
-            }
-        };
-        match aspa.process(
-            self.cert.cert(),
-            self.run.validation.strict,
-            |cert| manifest.check_crl(cert)
-        ) {
-            Ok((cert, aspa)) => {
-                manifest.metrics.valid_aspas += 1;
-                self.processor.process_aspa(uri, cert, aspa)?
-            }
-            Err(err) => {
-                manifest.metrics.invalid_aspas += 1;
-                warn!("{}: {}.", uri, err)
+        #[cfg(feature = "aspa")] {
+            let aspa = match Aspa::decode(
+                content, self.run.validation.strict
+            ) {
+                Ok(aspa) => aspa,
+                Err(err) => {
+                    warn!("{}: {}.", uri, err);
+                    manifest.metrics.invalid_aspas += 1;
+                    return Ok(())
+                }
+            };
+            match aspa.process(
+                self.cert.cert(),
+                self.run.validation.strict,
+                |cert| manifest.check_crl(cert)
+            ) {
+                Ok((cert, aspa)) => {
+                    manifest.metrics.valid_aspas += 1;
+                    self.processor.process_aspa(uri, cert, aspa)?
+                }
+                Err(err) => {
+                    manifest.metrics.invalid_aspas += 1;
+                    warn!("{}: {}.", uri, err)
+                }
             }
         }
         Ok(())
diff --git a/src/http/metrics.rs b/src/http/metrics.rs
index 1ca2010e..25aed454 100644
--- a/src/http/metrics.rs
+++ b/src/http/metrics.rs
@@ -256,14 +256,16 @@ fn object_metrics<'a>(
             .label("state", "invalid")
             .value(metrics.invalid_roas);
 
-        target.multi(metric).label(group.label(), name)
-            .label("type", "aspa")
-            .label("state", "valid")
-            .value(metrics.valid_aspas);
-        target.multi(metric).label(group.label(), name)
-            .label("type", "aspa")
-            .label("state", "invalid")
-            .value(metrics.invalid_aspas);
+        #[cfg(feature = "aspa")] {
+            target.multi(metric).label(group.label(), name)
+                .label("type", "aspa")
+                .label("state", "valid")
+                .value(metrics.valid_aspas);
+            target.multi(metric).label(group.label(), name)
+                .label("type", "aspa")
+                .label("state", "invalid")
+                .value(metrics.invalid_aspas);
+        }
 
         target.multi(metric).label(group.label(), name)
             .label("type", "gbr")
@@ -416,19 +418,20 @@ fn payload_metrics<'a>(
                 .value(metrics.contributed);
         }
 
-        target.multi(valid_metric)
-            .label(group.label(), name)
-            .label("type", "aspas")
-            .value(metrics.aspas.valid);
-        target.multi(duplicate_metric)
-            .label(group.label(), name)
-            .label("type", "aspas")
-            .value(metrics.aspas.duplicate);
-        target.multi(contributed_metric)
-            .label(group.label(), name)
-            .label("type", "aspas")
-            .value(metrics.aspas.contributed);
-
+        #[cfg(feature = "aspa")] {
+            target.multi(valid_metric)
+                .label(group.label(), name)
+                .label("type", "aspas")
+                .value(metrics.aspas.valid);
+            target.multi(duplicate_metric)
+                .label(group.label(), name)
+                .label("type", "aspas")
+                .value(metrics.aspas.duplicate);
+            target.multi(contributed_metric)
+                .label(group.label(), name)
+                .label("type", "aspas")
+                .value(metrics.aspas.contributed);
+        }
     }
 }
 
diff --git a/src/http/status.rs b/src/http/status.rs
index d7ca3b21..e43494cf 100644
--- a/src/http/status.rs
+++ b/src/http/status.rs
@@ -598,8 +598,10 @@ fn json_publication_metrics(
     target.member_raw("validROAs", metrics.valid_roas);
     target.member_raw("invalidROAs", metrics.invalid_roas);
     target.member_raw("validGBRs", metrics.valid_gbrs);
-    target.member_raw("invalidASPAs", metrics.invalid_aspas);
-    target.member_raw("validASPAs", metrics.valid_aspas);
+    #[cfg(feature = "aspa")] {
+        target.member_raw("invalidASPAs", metrics.invalid_aspas);
+        target.member_raw("validASPAs", metrics.valid_aspas);
+    }
     target.member_raw("invalidGBRs", metrics.invalid_gbrs);
     target.member_raw("otherObjects", metrics.others);
 }
@@ -628,9 +630,11 @@ fn json_payload_metrics(
         target.member_object("routerKeys", |target| {
             json_vrps_metrics(target, &payload.router_keys, false)
         });
-        target.member_object("aspas", |target| {
-            json_vrps_metrics(target, &payload.aspas, false)
-        })
+        #[cfg(feature = "aspa")] {
+            target.member_object("aspas", |target| {
+                json_vrps_metrics(target, &payload.aspas, false)
+            });
+        }
     });
 }