diff --git a/lib/checkother.cpp b/lib/checkother.cpp
index 801eaa513..627f9b939 100644
--- a/lib/checkother.cpp
+++ b/lib/checkother.cpp
@@ -2278,7 +2278,11 @@ void CheckOther::functionVariableUsage()
                 for (const Token *tok2 = tok->next(); tok2 && tok2->str() != ";"; tok2 = tok2->next())
                 {
                     if (tok2->varId())
+                    {
                         variables.read(tok2->varId());
+                        if (tok2->next()->isAssignmentOp())
+                            variables.write(tok2->varId());
+                    }
                 }
             }
         }
diff --git a/test/testunusedvar.cpp b/test/testunusedvar.cpp
index 3ddb229a0..dd49cec5e 100644
--- a/test/testunusedvar.cpp
+++ b/test/testunusedvar.cpp
@@ -83,6 +83,7 @@ private:
         TEST_CASE(localvar33); // ticket #2346
         TEST_CASE(localvar34); // ticket #2368
         TEST_CASE(localvar35); // ticket #2535
+        TEST_CASE(localvar36); // ticket #2805
         TEST_CASE(localvaralias1);
         TEST_CASE(localvaralias2); // ticket #1637
         TEST_CASE(localvaralias3); // ticket #1639
@@ -1383,6 +1384,16 @@ private:
         ASSERT_EQUALS("", errout.str());
     }
 
+    void localvar36() // ticket #2805
+    {
+        functionVariableUsage("int f() {\n"
+                              "    int a, b;\n"
+                              "    a = 2 * (b = 3);\n"
+                              "    return a + b;\n"
+                              "}\n");
+        ASSERT_EQUALS("", errout.str());
+    }
+
     void localvaralias1()
     {
         functionVariableUsage("void foo()\n"