diff --git a/web/src/main/java/org/springframework/security/web/bind/support/AuthenticationPrincipalArgumentResolver.java b/web/src/main/java/org/springframework/security/web/bind/support/AuthenticationPrincipalArgumentResolver.java
index 21f13ccea6..f64addd54c 100644
--- a/web/src/main/java/org/springframework/security/web/bind/support/AuthenticationPrincipalArgumentResolver.java
+++ b/web/src/main/java/org/springframework/security/web/bind/support/AuthenticationPrincipalArgumentResolver.java
@@ -106,7 +106,7 @@ public final class AuthenticationPrincipalArgumentResolver implements
         if(principal != null && !parameter.getParameterType().isAssignableFrom(principal.getClass())) {
             AuthenticationPrincipal authPrincipal = findMethodAnnotation(AuthenticationPrincipal.class, parameter);
             if(authPrincipal.errorOnInvalidType()) {
-                throw new ClassCastException(principal + " is not assiable to " + parameter.getParameterType());
+                throw new ClassCastException(principal + " is not assignable to " + parameter.getParameterType());
             } else {
                 return null;
             }