diff --git a/core/src/main/java/org/acegisecurity/providers/cas/populator/DaoCasAuthoritiesPopulator.java b/core/src/main/java/org/acegisecurity/providers/cas/populator/DaoCasAuthoritiesPopulator.java
index 69da2e4029..96b443e920 100644
--- a/core/src/main/java/org/acegisecurity/providers/cas/populator/DaoCasAuthoritiesPopulator.java
+++ b/core/src/main/java/org/acegisecurity/providers/cas/populator/DaoCasAuthoritiesPopulator.java
@@ -43,7 +43,7 @@ public class DaoCasAuthoritiesPopulator implements CasAuthoritiesPopulator, Init
     //~ Methods ========================================================================================================
 
     public void afterPropertiesSet() throws Exception {
-        Assert.notNull(this.userDetailsService, "An authenticationDao must be set");
+        Assert.notNull(this.userDetailsService, "A UserDetailsService must be set");
     }
 
     public UserDetails getUserDetails(String casUserId)