diff --git a/test/testunusedvar.cpp b/test/testunusedvar.cpp
index 2e5ef55c4..fe8f5bc22 100644
--- a/test/testunusedvar.cpp
+++ b/test/testunusedvar.cpp
@@ -1624,13 +1624,22 @@ private:
         ASSERT_EQUALS("", errout.str());
     }
 
-    void localvar32() { // ticket #2330
+    void localvar32() {
+        // ticket #2330 - fstream >> x
         functionVariableUsage("void f() {\n"
                               "    int x;\n"
                               "    fstream &f = getfile();\n"
                               "    f >> x;\n"
                               "}");
         ASSERT_EQUALS("", errout.str());
+
+        // ticket #4596 - if (c >>= x) {}
+        functionVariableUsage("void f() {\n"
+                              "    int x;\n"
+                              "    C c;\n" // possibly some stream class
+                              "    if (c >>= x) {}\n"
+                              "}");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void localvar33() { // ticket #2345