diff --git a/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/ContractSpec.groovy b/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/ContractSpec.groovy
index cacdc94ba0..8ac76a4862 100644
--- a/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/ContractSpec.groovy
+++ b/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/ContractSpec.groovy
@@ -108,7 +108,7 @@ class ContractSpec extends Specification {
 				property = value(consumer(regex("[0-9]{5}")))
 			}
 		then:
-			(property.serverValue as String).matches(/[0-9]{5}/)
+			(property.serverValue.toString()).matches(/[0-9]{5}/)
 	}
 
 	def 'should set a description'() {
diff --git a/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/InputSpec.groovy b/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/InputSpec.groovy
index 5c93855d1a..a22626e8b4 100644
--- a/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/InputSpec.groovy
+++ b/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/InputSpec.groovy
@@ -15,6 +15,6 @@ class InputSpec extends Specification {
 				property = $(consumer(regex("[0-9]{5}")))
 			}
 		then:
-			(property.serverValue as String).matches(/[0-9]{5}/)
+			(property.serverValue.toString()).matches(/[0-9]{5}/)
 	}
 }
diff --git a/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/OutputMessageSpec.groovy b/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/OutputMessageSpec.groovy
index 2a1da4d1ac..190080989e 100644
--- a/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/OutputMessageSpec.groovy
+++ b/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/OutputMessageSpec.groovy
@@ -15,6 +15,6 @@ class OutputMessageSpec extends Specification {
 				property = $(consumer(regex("[0-9]{5}")))
 			}
 		then:
-			(property.serverValue as String).matches(/[0-9]{5}/)
+			(property.serverValue.toString()).matches(/[0-9]{5}/)
 	}
 }
diff --git a/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/RequestSpec.groovy b/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/RequestSpec.groovy
index caf7522f62..3ed4da5208 100644
--- a/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/RequestSpec.groovy
+++ b/spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/RequestSpec.groovy
@@ -32,6 +32,6 @@ class RequestSpec extends Specification {
 				property = value(consumer(regex("[0-9]{5}")))
 			}
 		then:
-			(property.serverValue as String).matches(/[0-9]{5}/)
+			(property.serverValue.toString()).matches(/[0-9]{5}/)
 	}
 }