diff --git a/common/JackError.cpp b/common/JackError.cpp
index 5338bd3c..d78f95e5 100644
--- a/common/JackError.cpp
+++ b/common/JackError.cpp
@@ -33,7 +33,7 @@ static bool change_thread_log_function(jack_log_function_t log_function)
             && jack_tls_set(JackGlobals::fKeyLogFunction, (void*)log_function));
 }
 
-SERVER_EXPORT bool set_threaded_log_function()
+SERVER_EXPORT int set_threaded_log_function()
 {
     return change_thread_log_function(JackMessageBufferAdd);
 }
diff --git a/common/JackError.h b/common/JackError.h
index 27a7e323..03b4eada 100644
--- a/common/JackError.h
+++ b/common/JackError.h
@@ -55,7 +55,7 @@ extern "C"
 
     void jack_log_function(int level, const char *message);
    
-    SERVER_EXPORT bool set_threaded_log_function();
+    SERVER_EXPORT int set_threaded_log_function();
 
 #ifdef __cplusplus
 }