diff --git a/core/src/HmacSha1Signer.cc b/core/src/HmacSha1Signer.cc
index 0c739c565c..53d5693b2e 100644
--- a/core/src/HmacSha1Signer.cc
+++ b/core/src/HmacSha1Signer.cc
@@ -79,7 +79,7 @@ std::string HmacSha1Signer::generate(const std::string &src,
                       CRYPT_STRING_BASE64 | CRYPT_STRING_NOCRLF, dest, &dlen);
 
   std::string ret = std::string(dest, dlen);
-  delete dest;
+  delete[] dest;
   return ret;
 #else
   unsigned char md[EVP_MAX_BLOCK_LENGTH];
diff --git a/core/src/ServiceRequest.cc b/core/src/ServiceRequest.cc
index c6c79afe5a..9fe06242dd 100644
--- a/core/src/ServiceRequest.cc
+++ b/core/src/ServiceRequest.cc
@@ -62,7 +62,7 @@ ServiceRequest &ServiceRequest::operator=(ServiceRequest &&other) {
 
 ServiceRequest::~ServiceRequest() {
   if (content_)
-    delete content_;
+    delete[] content_;
 }
 
 const char *ServiceRequest::content() const { return content_; }
@@ -73,7 +73,7 @@ bool ServiceRequest::hasContent() const { return (contentSize_ != 0); }
 
 void ServiceRequest::setContent(const char *data, size_t size) {
   if (content_)
-    delete content_;
+    delete[] content_;
   content_ = nullptr;
   contentSize_ = 0;
   if (size) {
diff --git a/core/src/Utils.cc b/core/src/Utils.cc
index 72b47d7271..f9856830c1 100644
--- a/core/src/Utils.cc
+++ b/core/src/Utils.cc
@@ -89,7 +89,7 @@ std::string AlibabaCloud::ComputeContentMD5(const char *data, size_t size) {
                       CRYPT_STRING_BASE64 | CRYPT_STRING_NOCRLF, dest, &dlen);
 
   std::string ret = std::string(dest, dlen);
-  delete dest;
+  delete[] dest;
   return ret;
 #else
   unsigned char md[MD5_DIGEST_LENGTH];