diff --git a/src/openrct2/config/IniWriter.cpp b/src/openrct2/config/IniWriter.cpp
index 04856ca677..57451e61a0 100644
--- a/src/openrct2/config/IniWriter.cpp
+++ b/src/openrct2/config/IniWriter.cpp
@@ -42,7 +42,7 @@ public:
         WriteLine("[" + name + "]");
     }
 
-    void WriteBoolean(const std::string &name, bool value)
+    void WriteBoolean(const std::string &name, bool value) override
     {
         WriteProperty(name, value ? "true" : "false");
     }
diff --git a/src/openrct2/network/network.cpp b/src/openrct2/network/network.cpp
index ce8ef1a5a9..260d3438e1 100644
--- a/src/openrct2/network/network.cpp
+++ b/src/openrct2/network/network.cpp
@@ -1628,7 +1628,7 @@ void Network::Server_Handle_AUTH(NetworkConnection& connection, NetworkPacket& p
 			}
 		}
 
-		if (gConfigNetwork.maxplayers <= player_list.size()) {
+		if ((size_t)gConfigNetwork.maxplayers <= player_list.size()) {
 			connection.AuthStatus = NETWORK_AUTH_FULL;
 		} else
 		if (connection.AuthStatus == NETWORK_AUTH_VERIFIED) {
diff --git a/src/openrct2/platform/linux.c b/src/openrct2/platform/linux.c
index 252232f9a2..79bb4c1bb3 100644
--- a/src/openrct2/platform/linux.c
+++ b/src/openrct2/platform/linux.c
@@ -461,7 +461,7 @@ bool platform_open_common_file_dialog(utf8 *outFilename, file_dialog_desc *desc,
 	return 1;
 }
 
-utf8 *platform_open_directory_browser(utf8 *title) {
+utf8 *platform_open_directory_browser(const utf8 *title) {
 	size_t size;
 	dialog_type dtype;
 	sint32 exit_value;
diff --git a/src/openrct2/platform/platform.h b/src/openrct2/platform/platform.h
index 29a81740b7..df2181f2c5 100644
--- a/src/openrct2/platform/platform.h
+++ b/src/openrct2/platform/platform.h
@@ -195,7 +195,7 @@ void platform_get_user_directory(utf8 *outPath, const utf8 *subDirectory, size_t
 utf8* platform_get_username();
 void platform_show_messagebox(const utf8 * message);
 bool platform_open_common_file_dialog(utf8 *outFilename, file_dialog_desc *desc, size_t outSize);
-utf8 *platform_open_directory_browser(utf8 *title);
+utf8 *platform_open_directory_browser(const utf8 *title);
 uint8 platform_get_locale_currency();
 uint8 platform_get_currency_value(const char *currencyCode);
 uint16 platform_get_locale_language();
diff --git a/src/openrct2/platform/windows.c b/src/openrct2/platform/windows.c
index 6af069d80f..fa568c323d 100644
--- a/src/openrct2/platform/windows.c
+++ b/src/openrct2/platform/windows.c
@@ -694,7 +694,7 @@ bool platform_open_common_file_dialog(utf8 *outFilename, file_dialog_desc *desc,
 	return result;
 }
 
-utf8 *platform_open_directory_browser(utf8 *title)
+utf8 *platform_open_directory_browser(const utf8 *title)
 {
 	BROWSEINFOW bi;
 	wchar_t pszBuffer[MAX_PATH], wctitle[256];