diff --git a/stepmania/src/arch/Threads/Threads_Pthreads.cpp b/stepmania/src/arch/Threads/Threads_Pthreads.cpp
index 737ffed5c7..30cb1bfe0f 100644
--- a/stepmania/src/arch/Threads/Threads_Pthreads.cpp
+++ b/stepmania/src/arch/Threads/Threads_Pthreads.cpp
@@ -1,5 +1,6 @@
 #include "global.h"
 #include "Threads_Pthreads.h"
+#include "RageUtil.h"
 #include <sys/time.h>
 #include <errno.h>
 
@@ -225,7 +226,7 @@ SemaImpl_Pthreads::~SemaImpl_Pthreads()
 int SemaImpl_Pthreads::GetValue() const
 {
 	int ret;
-	sem_getvalue( &sem, &ret );
+	sem_getvalue( const_cast<sem_t *>(&sem), &ret );
 	return ret;
 }
 
diff --git a/stepmania/src/arch/Threads/Threads_Pthreads.h b/stepmania/src/arch/Threads/Threads_Pthreads.h
index 3dd73fc407..d171473118 100644
--- a/stepmania/src/arch/Threads/Threads_Pthreads.h
+++ b/stepmania/src/arch/Threads/Threads_Pthreads.h
@@ -7,6 +7,8 @@
 #define PID_BASED_THREADS
 #endif
 
+#include <semaphore.h>
+
 class ThreadImpl_Pthreads: public ThreadImpl
 {
 public: