diff --git a/audio/filters/boolean.h b/audio/filters/boolean.h
new file mode 100644
index 0000000000..b0a20bd8d6
--- /dev/null
+++ b/audio/filters/boolean.h
@@ -0,0 +1,33 @@
+/* RetroArch - A frontend for libretro.
+ * Copyright (C) 2010-2014 - Hans-Kristian Arntzen
+ *
+ * RetroArch is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Found-
+ * ation, either version 3 of the License, or (at your option) any later version.
+ *
+ * RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with RetroArch.
+ * If not, see .
+ */
+
+#ifndef __RARCH_BOOLEAN_H
+#define __RARCH_BOOLEAN_H
+
+#ifndef __cplusplus
+
+#if defined(_MSC_VER) && !defined(SN_TARGET_PS3)
+/* Hack applied for MSVC when compiling in C89 mode as it isn't C99 compliant. */
+#define bool unsigned char
+#define true 1
+#define false 0
+#else
+#include
+#endif
+
+#endif
+
+#endif
+
diff --git a/audio/filters/eq.c b/audio/filters/eq.c
index ad5b50b968..bfea679658 100644
--- a/audio/filters/eq.c
+++ b/audio/filters/eq.c
@@ -22,8 +22,7 @@
#include
#include
#include
-#include
-#include
+#include "boolean.h"
#include
#ifndef M_PI