diff --git a/src/checkstyle/com/puppycrawl/tools/checkstyle/checks/FinalParametersCheck.java b/src/checkstyle/com/puppycrawl/tools/checkstyle/checks/FinalParametersCheck.java
index 81556bc20..e907fda03 100644
--- a/src/checkstyle/com/puppycrawl/tools/checkstyle/checks/FinalParametersCheck.java
+++ b/src/checkstyle/com/puppycrawl/tools/checkstyle/checks/FinalParametersCheck.java
@@ -42,7 +42,7 @@ public class FinalParametersCheck extends Check
     {
         // don't flag interfaces
         final DetailAST container = aAST.getParent().getParent();
-        if (container.getType() != TokenTypes.CLASS_DEF) {
+        if (container.getType() == TokenTypes.INTERFACE_DEF) {
             return;
         }