diff --git a/src/misc.c b/src/misc.c
index ec02750a..41a7a98a 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -624,7 +624,7 @@ void c_initialize_firsttime()
 }
 
 #if !defined(TESTING) && !defined(__APPLE__)
-extern void cpu_thread(void *dummyptr);
+extern void *cpu_thread(void *dummyptr);
 
 int main(int _argc, char **_argv) {
     argc = _argc;
@@ -634,7 +634,7 @@ int main(int _argc, char **_argv) {
     c_initialize_firsttime();           /* init svga graphics and vm */
 
     // spin off cpu thread
-    pthread_create(&cpu_thread_id, NULL, (void *) &cpu_thread, (void *)NULL);
+    pthread_create(&cpu_thread_id, NULL, (void *) &cpu_thread,(void *)NULL);
 
     c_keys_set_key(kF8); // show credits
 
diff --git a/src/timing.c b/src/timing.c
index 081e5510..34327281 100644
--- a/src/timing.c
+++ b/src/timing.c
@@ -159,7 +159,7 @@ void timing_initialize()
     _timing_initialize(cpu_scale_factor);
 }
 
-void cpu_thread(void *dummyptr) {
+void *cpu_thread(void *dummyptr) {
 
     assert(pthread_self() == cpu_thread_id);
 
@@ -325,6 +325,8 @@ void cpu_thread(void *dummyptr) {
 
         reinitialize();
     } while (1);
+
+    return NULL;
 }
 
 // From AppleWin...
diff --git a/src/timing.h b/src/timing.h
index 80df0e1a..ca298cab 100644
--- a/src/timing.h
+++ b/src/timing.h
@@ -56,7 +56,7 @@ void timing_toggle_cpu_speed();
 
 void timing_initialize();
 
-void cpu_thread();
+void *cpu_thread(void *ignored);
 
 void CpuCalcCycles(const unsigned long nExecutedCycles);