diff --git a/stepmania/PBProject/Installer/BuildInstaller.cpp b/stepmania/PBProject/Installer/BuildInstaller.cpp
index 7281a8f1cb..b985dca1be 100644
--- a/stepmania/PBProject/Installer/BuildInstaller.cpp
+++ b/stepmania/PBProject/Installer/BuildInstaller.cpp
@@ -17,6 +17,7 @@ using namespace std;
 #include <cstring>
 #include <stack>
 #include <map>
+#include <sys/errno.h>
 #include "StdString.h"
 #include "InstallerFile.h"
 #include "Processor.h"
diff --git a/stepmania/PBProject/Installer/Util.cpp b/stepmania/PBProject/Installer/Util.cpp
index a904d79afc..b02806d97b 100644
--- a/stepmania/PBProject/Installer/Util.cpp
+++ b/stepmania/PBProject/Installer/Util.cpp
@@ -11,6 +11,7 @@
 #include <sys/stat.h>
 #include <sys/errno.h>
 #include <sys/wait.h>
+#include <unistd.h>
 #include <dirent.h>
 #include <fcntl.h>
 #include "Util.h"