diff --git a/apps/codecs/libatrac/fixp_math.h b/apps/codecs/libatrac/fixp_math.h
index 5bfc2c5703..ed72cf6a0f 100644
--- a/apps/codecs/libatrac/fixp_math.h
+++ b/apps/codecs/libatrac/fixp_math.h
@@ -1,4 +1,9 @@
 #include <stdlib.h>
+#ifdef ROCKBOX
+#include "asm_arm.h"
+#include "asm_mcf5249.h"
+#include "codeclib_misc.h"
+#endif
 
 /* Macros for converting between various fixed-point representations and floating point. */
 #define ONE_16 (1L << 16)
@@ -8,7 +13,12 @@
 #define fix31tof64(x)     (float)((float)(x) / (float)(1 << 31))
 
 /* Fixed point math routines for use in atrac3.c */
-inline int32_t fixdiv16(int32_t x, int32_t y);
+#ifdef ROCKBOX
+#define fixmul31(x,y) (MULT31(x,y))
+#define fixmul16(x,y) (MULT32(x,y))
+#else
 inline int32_t fixmul16(int32_t x, int32_t y);
 inline int32_t fixmul31(int32_t x, int32_t y);
+#endif /* ROCKBOX */
+inline int32_t fixdiv16(int32_t x, int32_t y);
 inline int32_t fastSqrt(int32_t n);