diff --git a/base/org.eclipse.jdt.groovy.core/src/org/codehaus/jdt/groovy/internal/compiler/ast/GroovyCompilationUnitDeclaration.java b/base/org.eclipse.jdt.groovy.core/src/org/codehaus/jdt/groovy/internal/compiler/ast/GroovyCompilationUnitDeclaration.java
index 040a8ac1c1..301d8d5a09 100644
--- a/base/org.eclipse.jdt.groovy.core/src/org/codehaus/jdt/groovy/internal/compiler/ast/GroovyCompilationUnitDeclaration.java
+++ b/base/org.eclipse.jdt.groovy.core/src/org/codehaus/jdt/groovy/internal/compiler/ast/GroovyCompilationUnitDeclaration.java
@@ -2575,7 +2575,7 @@ private void fixupSourceLocationsForTypeDeclaration(GroovyTypeDeclaration typeDe
             } else {
                 // start and end of the type name; scripts do not have a name, so use start instead
                 typeDeclaration.sourceStart = Math.max(classNode.getNameStart(), classNode.getStart());
-                typeDeclaration.sourceEnd = Math.max(classNode.getNameEnd(), classNode.getStart()); // incl. extends/implements?
+                typeDeclaration.sourceEnd = Math.max(classNode.getNameEnd(), classNode.getStart() - 1);
 
                 // start and end of the entire declaration including Javadoc and ending at the last close bracket
                 Javadoc doc = findJavadoc(classNode.getLineNumber());