diff --git a/gcpbuildcache/build.gradle.kts b/gcpbuildcache/build.gradle.kts
index c5aa52c..88b7e9b 100644
--- a/gcpbuildcache/build.gradle.kts
+++ b/gcpbuildcache/build.gradle.kts
@@ -89,5 +89,6 @@ tasks.named<Task>("check") {
 }
 
 tasks.withType<Sign>().configureEach {
-    onlyIf { project.hasProperty("signing.keyId") }
+    val signingKeyIdPresent = project.hasProperty("signing.keyId")
+    onlyIf("signing.keyId is present") { signingKeyIdPresent }
 }
diff --git a/s3buildcache/build.gradle.kts b/s3buildcache/build.gradle.kts
index bd140e6..78e152c 100644
--- a/s3buildcache/build.gradle.kts
+++ b/s3buildcache/build.gradle.kts
@@ -98,5 +98,6 @@ tasks.named<Task>("check") {
 }
 
 tasks.withType<Sign>().configureEach {
-    onlyIf { project.hasProperty("signing.keyId") }
+    val signingKeyIdPresent = project.hasProperty("signing.keyId")
+    onlyIf("signing.keyId is present") { signingKeyIdPresent }
 }