diff --git a/ExprPrimaryNodes.py b/ExprPrimaryNodes.py
index 687be3d453957b7e01dafc35705476c3a56dcba9..c00680a400a63fb5dc50ce22225387f5234cc632 100644
--- a/ExprPrimaryNodes.py
+++ b/ExprPrimaryNodes.py
@@ -393,8 +393,8 @@ class ExprNode(ASTNode):
                 return
 
         # String concat:
-        if (self.left.myType.name =='java.lang.String' and self.right.myType.name not in ['void']) \
-        or (self.right.myType.name =='java.lang.String' and self.left.myType.name not in ['void']):
+        if ((self.left.myType.name =='java.lang.String' and self.right.myType.name not in ['void']) \
+        or (self.right.myType.name =='java.lang.String' and self.left.myType.name not in ['void'])) and self.op == '+':
             self.myType = TypeStruct('java.lang.String', self.env.getNode('java.lang.String', 'type'))
             self.myType.link(self.env)
             return