diff --git a/lib/checkunusedvar.cpp b/lib/checkunusedvar.cpp
index e8d8ac958..77662060b 100644
--- a/lib/checkunusedvar.cpp
+++ b/lib/checkunusedvar.cpp
@@ -897,8 +897,10 @@ void CheckUnusedVar::checkFunctionVariableUsage_iterateScopes(const Scope* const
 
             if (tok && tok->isAssignmentOp() && tok->str() != "=") {
                 variables.use(varid1, tok);
-                if (Token::Match(tok, "%assign% %name%"))
+                if (Token::Match(tok, "%assign% %name%")) {
                     tok = tok->next();
+                    variables.read(tok->varId(), tok);
+                }
             }
 
             if (pre || post)
diff --git a/test/testunusedvar.cpp b/test/testunusedvar.cpp
index 38d3be21f..974ba22d5 100644
--- a/test/testunusedvar.cpp
+++ b/test/testunusedvar.cpp
@@ -3153,6 +3153,13 @@ private:
                               "  return a;\n"
                               "}");
         ASSERT_EQUALS("", errout.str());
+
+        functionVariableUsage("void f() {\n"
+                              "  Fred fred;\n"
+                              "  int *a; a = b;\n"
+                              "  fred += a;\n"
+                              "}");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void localvarFor() {