diff --git a/src/interpreter.cc b/src/interpreter.cc
index 826b606..0bc49b7 100644
--- a/src/interpreter.cc
+++ b/src/interpreter.cc
@@ -127,7 +127,7 @@ char* programGetCurrentProcedureName(Program* program)
 }
 
 // 0x4671F0
-__declspec(noreturn) void programFatalError(const char* format, ...)
+[[noreturn]] void programFatalError(const char* format, ...)
 {
     char string[260];
 
diff --git a/src/interpreter.h b/src/interpreter.h
index beee1bf..ff0d9f8 100644
--- a/src/interpreter.h
+++ b/src/interpreter.h
@@ -189,7 +189,7 @@ int _checkWait(Program* program);
 void _interpretOutputFunc(int (*func)(char*));
 int _interpretOutput(const char* format, ...);
 char* programGetCurrentProcedureName(Program* s);
-__declspec(noreturn) void programFatalError(const char* str, ...);
+[[noreturn]] void programFatalError(const char* str, ...);
 opcode_t stackReadInt16(unsigned char* data, int pos);
 int stackReadInt32(unsigned char* a1, int a2);
 void stackWriteInt16(int value, unsigned char* a2, int a3);
diff --git a/src/memory_manager.cc b/src/memory_manager.cc
index 1abf8df..2c7b5a0 100644
--- a/src/memory_manager.cc
+++ b/src/memory_manager.cc
@@ -44,7 +44,7 @@ int memoryManagerPrintError(const char* format, ...)
 }
 
 // 0x484610
-__declspec(noreturn) void memoryManagerFatalAllocationError(const char* func, size_t size, const char* file, int line)
+[[noreturn]] void memoryManagerFatalAllocationError(const char* func, size_t size, const char* file, int line)
 {
     memoryManagerPrintError("%s: Error allocating block of size %ld (%x), %s %d\n", func, size, size, file, line);
     exit(1);
diff --git a/src/memory_manager.h b/src/memory_manager.h
index 10e3c5b..6dd24dd 100644
--- a/src/memory_manager.h
+++ b/src/memory_manager.h
@@ -15,7 +15,7 @@ extern char gMemoryManagerLastError[256];
 
 void memoryManagerDefaultPrintErrorImpl(const char* string);
 int memoryManagerPrintError(const char* format, ...);
-__declspec(noreturn) void memoryManagerFatalAllocationError(const char* func, size_t size, const char* file, int line);
+[[noreturn]] void memoryManagerFatalAllocationError(const char* func, size_t size, const char* file, int line);
 void* memoryManagerDefaultMallocImpl(size_t size);
 void* memoryManagerDefaultReallocImpl(void* ptr, size_t size);
 void memoryManagerDefaultFreeImpl(void* ptr);