diff --git a/bbruntime/bbfilesystem.cpp b/bbruntime/bbfilesystem.cpp
index a87d8489..6a68fa14 100644
--- a/bbruntime/bbfilesystem.cpp
+++ b/bbruntime/bbfilesystem.cpp
@@ -214,7 +214,7 @@ void bbUnzip(BBStr* src, BBStr* dst, BBStr* password) {
 		UnzipItem(hz, zi, ze.name);
 	}
 	CloseZip(hz);
-	delete src, dst, password;
+	delete src; delete dst; delete password;
 }
 
 BBStr* bbAbsolutePath(BBStr* path) {
diff --git a/bbruntime/bbruntime.cpp b/bbruntime/bbruntime.cpp
index 35c84221..b6aafc94 100644
--- a/bbruntime/bbruntime.cpp
+++ b/bbruntime/bbruntime.cpp
@@ -25,7 +25,7 @@ void bbDisableClose() {
 
 void bbAppTitle(BBStr* ti, BBStr* cp) {
 	gx_runtime->setTitle(*ti, *cp);
-	delete ti, cp;
+	delete ti; delete cp;
 }
 
 void bbRuntimeError(BBStr* str) {
@@ -167,7 +167,7 @@ void bbSetClipboardContents(BBStr* contents) {
 
 void bbMessageBox(BBStr* title, BBStr* text) {
 	MessageBoxW(gx_runtime->hwnd, UTF8::convertToUtf16(text->c_str()).c_str(), UTF8::convertToUtf16(title->c_str()).c_str(), MB_APPLMODAL | MB_ICONINFORMATION);
-	delete title, text;
+	delete title; delete text;
 }
 
 void bbDebugLog(BBStr* t) {
diff --git a/bbruntime/bbsockets.cpp b/bbruntime/bbsockets.cpp
index 85aa1a0f..f62ac19c 100644
--- a/bbruntime/bbsockets.cpp
+++ b/bbruntime/bbsockets.cpp
@@ -475,7 +475,7 @@ BBStr* bbParseDomainTXT(BBStr* txt, BBStr* name) {
 		result = s1.substr(n);
 	if ((a = result.find(';')) != std::string::npos)
 		result = result.substr(s2.length() + 1, a - s2.length() - 1);
-	delete txt, name;
+	delete txt; delete name;
 	return new BBStr(result);
 }
 
@@ -531,7 +531,7 @@ void bbDownloadFile(BBStr* url, BBStr* file) {
 		InternetCloseHandle(hSession);
 		hSession = NULL;
 	}
-	delete url, file;
+	delete url; delete file;
 }
 
 void sockets_link(void(*rtSym)(const char*, void*)) {
diff --git a/bbruntime/bbstring.cpp b/bbruntime/bbstring.cpp
index 11bf4fe6..9af160e9 100644
--- a/bbruntime/bbstring.cpp
+++ b/bbruntime/bbstring.cpp
@@ -27,7 +27,7 @@ BBStr* bbRight(BBStr* s, int n) {
 
 BBStr* bbReplace(BBStr* s, BBStr* from, BBStr* to) {
 	std::string str = UTF8::replaceAll(s->c_str(), from->c_str(), to->c_str());
-	delete s, from, to;
+	delete s; delete from; delete to;
 	return new BBStr(str);
 }
 
diff --git a/gxruntime/gxutf8.cpp b/gxruntime/gxutf8.cpp
index 37f6c52f..f19c85da 100644
--- a/gxruntime/gxutf8.cpp
+++ b/gxruntime/gxutf8.cpp
@@ -198,7 +198,7 @@ std::string UTF8::replaceAll(const std::string& string, const std::string& patte
 
 	for (unsigned pos = str.find(pattern, 0); pos != std::string::npos; pos = str.find(pattern, pos + nsize))
 	{
-		str.replace(pos, psize, newpat);
+		str = str.replace(pos, psize, newpat);
 	}
 	return str;
 }