diff --git a/src/archutils/Darwin/DarwinThreadHelpers.cpp b/src/archutils/Darwin/DarwinThreadHelpers.cpp
index 6e65114d9e..f6294a116d 100644
--- a/src/archutils/Darwin/DarwinThreadHelpers.cpp
+++ b/src/archutils/Darwin/DarwinThreadHelpers.cpp
@@ -7,6 +7,7 @@
 
 #include <cmath>
 #include <cstdint>
+#include <string>
 
 bool SuspendThread( uint64_t threadHandle )
 {
@@ -59,7 +60,7 @@ bool GetThreadBacktraceContext( uint64_t iID, BacktraceContext *ctx )
 #endif
 }
 
-const char* SetThreadPrecedence( float prec )
+std::string SetThreadPrecedence( float prec )
 {
 	// Real values are between 0 and 63.
 	DEBUG_ASSERT( 0.0f <= prec && prec <= 1.0f );
diff --git a/src/archutils/Darwin/DarwinThreadHelpers.h b/src/archutils/Darwin/DarwinThreadHelpers.h
index 48e0d37c58..228880ea49 100644
--- a/src/archutils/Darwin/DarwinThreadHelpers.h
+++ b/src/archutils/Darwin/DarwinThreadHelpers.h
@@ -2,6 +2,7 @@
 #define DARWIN_THREAD_HELPERS_H
 
 #include <cstdint>
+#include <string>
 
 /**
  * @brief Attempt to suspend the specified thread.
@@ -23,7 +24,7 @@ uint64_t GetCurrentThreadId();
  * Valid values for the thread are from 0.0f to 1.0f.
  * 0.5f is the default.
  * @param prec the precedence to set. */
-const char* SetThreadPrecedence( float prec );
+std::string SetThreadPrecedence( float prec );
 
 #endif