diff --git a/lib/checkother.cpp b/lib/checkother.cpp
index 0a9840fa1..91124b709 100644
--- a/lib/checkother.cpp
+++ b/lib/checkother.cpp
@@ -612,6 +612,7 @@ void CheckOther::checkRedundantAssignment()
 
         std::map<unsigned int, const Token*> varAssignments;
         std::map<unsigned int, const Token*> memAssignments;
+        std::set<unsigned int> initialized;
         const Token* writtenArgumentsEnd = 0;
 
         for (const Token* tok = scope->classStart->next(); tok != scope->classEnd; tok = tok->next()) {
@@ -672,10 +673,12 @@ void CheckOther::checkRedundantAssignment()
                     const Token* param1 = tok->tokAt(2);
                     writtenArgumentsEnd = param1->next();
                     if (param1->varId() && param1->strAt(1) == "," && !Token::Match(tok, "strcat|strncat|wcscat|wcsncat")) {
-                        std::map<unsigned int, const Token*>::iterator it = memAssignments.find(param1->varId());
-                        if (it == memAssignments.end())
+                        if (tok->str() == "memset" && initialized.find(param1->varId()) == initialized.end() && param1->variable() && param1->variable()->isLocal() && param1->variable()->isArray())
+                            initialized.insert(param1->varId());
+                        else if (memAssignments.find(param1->varId()) == memAssignments.end())
                             memAssignments[param1->varId()] = tok;
                         else {
+                            const std::map<unsigned int, const Token*>::iterator it = memAssignments.find(param1->varId());
                             if (scope->type == Scope::eSwitch && Token::findmatch(it->second, "default|case", tok) && warning)
                                 redundantCopyInSwitchError(it->second, tok, param1->str());
                             else if (performance)
diff --git a/test/testother.cpp b/test/testother.cpp
index fb8cb77a2..d82891b1d 100644
--- a/test/testother.cpp
+++ b/test/testother.cpp
@@ -5643,8 +5643,7 @@ private:
               "    memcpy(a, b, 5);\n"
               "    memmove(a, b, 5);\n"
               "}");
-        ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (performance) Buffer 'a' is being written before its old content has been used.\n"
-                      "[test.cpp:3] -> [test.cpp:5]: (performance) Buffer 'a' is being written before its old content has been used.\n"
+        ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:5]: (performance) Buffer 'a' is being written before its old content has been used.\n"
                       "[test.cpp:3]: (warning, inconclusive) Array 'a' is filled incompletely. Did you forget to multiply the size given to 'memset()' with 'sizeof(*a)'?\n"
                       "[test.cpp:4]: (warning, inconclusive) Array 'a' is filled incompletely. Did you forget to multiply the size given to 'memcpy()' with 'sizeof(*a)'?\n"
                       "[test.cpp:5]: (warning, inconclusive) Array 'a' is filled incompletely. Did you forget to multiply the size given to 'memmove()' with 'sizeof(*a)'?\n", errout.str());
@@ -5949,6 +5948,14 @@ private:
               "        memset(a, 0, size);\n"
               "}");
         ASSERT_EQUALS("", errout.str());
+
+        // #4455 - initialization of local buffer
+        check("void f(void) {"
+              "    char buf[10];\n"
+              "    memset(buf, 0, 10);\n"
+              "    strcpy(buf, string);\n"
+              "}");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void varFuncNullUB() { // #4482