diff --git a/lib/checkautovariables.cpp b/lib/checkautovariables.cpp
index c12efa50b..1a633aeaa 100644
--- a/lib/checkautovariables.cpp
+++ b/lib/checkautovariables.cpp
@@ -118,12 +118,27 @@ static bool variableIsUsedInScope(const Token* start, unsigned int varId, const
     return false;
 }
 
+void CheckAutoVariables::assignFunctionArg()
+{
+    if (!_settings->isEnabled("warning"))
+        return;
+    const SymbolDatabase *symbolDatabase = _tokenizer->getSymbolDatabase();
+    const std::size_t functions = symbolDatabase->functionScopes.size();
+    for (std::size_t i = 0; i < functions; ++i) {
+        const Scope * scope = symbolDatabase->functionScopes[i];
+        for (const Token *tok = scope->classStart; tok && tok != scope->classEnd; tok = tok->next()) {
+            if (Token::Match(tok, "[;{}] %var% =") &&
+                isNonReferenceArg(tok->next()) &&
+                !variableIsUsedInScope(Token::findsimplematch(tok->tokAt(2), ";"), tok->next()->varId(), scope)) {
+                errorUselessAssignmentPtrArg(tok->next());
+            }
+        }
+    }
+}
+
 void CheckAutoVariables::autoVariables()
 {
     const SymbolDatabase *symbolDatabase = _tokenizer->getSymbolDatabase();
-
-    const bool reportWarnings(_settings->isEnabled("warning"));
-
     const std::size_t functions = symbolDatabase->functionScopes.size();
     for (std::size_t i = 0; i < functions; ++i) {
         const Scope * scope = symbolDatabase->functionScopes[i];
@@ -135,11 +150,6 @@ void CheckAutoVariables::autoVariables()
             } else if (Token::Match(tok, "[;{}] * %var% = & %var%") && isPtrArg(tok->tokAt(2)) && isAutoVar(tok->tokAt(5))) {
                 if (checkRvalueExpression(tok->tokAt(5)))
                     errorAutoVariableAssignment(tok->next(), false);
-            } else if (reportWarnings &&
-                       Token::Match(tok, "[;{}] %var% =") &&
-                       isNonReferenceArg(tok->next()) &&
-                       !variableIsUsedInScope(Token::findsimplematch(tok->tokAt(2), ";"), tok->next()->varId(), scope)) {
-                errorUselessAssignmentPtrArg(tok->next());
             } else if (Token::Match(tok, "[;{}] %var% . %var% = & %var%")) {
                 // TODO: check if the parameter is only changed temporarily (#2969)
                 if (_settings->inconclusive) {
diff --git a/lib/checkautovariables.h b/lib/checkautovariables.h
index cafe97dda..a2624c463 100644
--- a/lib/checkautovariables.h
+++ b/lib/checkautovariables.h
@@ -44,6 +44,7 @@ public:
     /** @brief Run checks against the normal token list */
     void runChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
         CheckAutoVariables checkAutoVariables(tokenizer, settings, errorLogger);
+        checkAutoVariables.assignFunctionArg();
         checkAutoVariables.returnReference();
     }
 
@@ -53,6 +54,9 @@ public:
         checkAutoVariables.returnPointerToLocalArray();
     }
 
+    /** assign function argument */
+    void assignFunctionArg();
+
     /** Check auto variables */
     void autoVariables();
 
diff --git a/test/testautovariables.cpp b/test/testautovariables.cpp
index 07b5a5879..778a7b1f8 100644
--- a/test/testautovariables.cpp
+++ b/test/testautovariables.cpp
@@ -49,6 +49,7 @@ private:
 
         CheckAutoVariables checkAutoVariables(&tokenizer, &settings, this);
         checkAutoVariables.returnReference();
+        checkAutoVariables.assignFunctionArg();
 
         if (runSimpleChecks) {
             const std::string str1(tokenizer.tokens()->stringifyList(0,true));
@@ -305,6 +306,13 @@ private:
               "    p = 0;\n"
               "}");
         ASSERT_EQUALS("", errout.str());
+
+        check("double foo(double d) {\n" // #5005
+              "    int i = d;\n"
+              "    d = i;\n"
+              "    return d;"
+              "}",false,false);
+        ASSERT_EQUALS("", errout.str());
     }
 
     void testautovar11() { // #4641 - fp, assign local struct member address to function parameter