diff --git a/es-core/src/utils/StringUtil.cpp b/es-core/src/utils/StringUtil.cpp
index 281c0f5c1..3b6510f3b 100644
--- a/es-core/src/utils/StringUtil.cpp
+++ b/es-core/src/utils/StringUtil.cpp
@@ -7,8 +7,11 @@
 //  Convert characters to Unicode, upper-/lowercase conversion, string formatting etc.
 //
 
+// Suppress codecvt deprecation warnings.
 #if defined(_MSC_VER) // MSVC compiler.
 #define _SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING
+#elif defined(__APPLE__)
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
 #endif
 
 #include "utils/StringUtil.h"