diff --git a/src/include/sof/math/numbers.h b/src/include/sof/math/numbers.h
index 5e314aa2c..6ecfc9024 100644
--- a/src/include/sof/math/numbers.h
+++ b/src/include/sof/math/numbers.h
@@ -18,6 +18,12 @@
  */
 #define MIN(a, b) ((a) < (b) ? (a) : (b))
 #define MAX(a, b) ((a) < (b) ? (b) : (a))
+
+#define ROUND_DOWN(size, alignment) ({			\
+	typeof(size) __size = (size);			\
+	typeof(alignment) __alignment = (alignment);	\
+	__size - (__size % __alignment);		\
+})
 #endif /* ! __ZEPHYR__ */
 
 #define ABS(a) ({		\
@@ -29,13 +35,7 @@
 	__a < 0 ? -1 :		\
 	__a > 0 ? 1 : 0;	\
 })
-#ifndef ROUND_DOWN
-#define ROUND_DOWN(size, alignment) ({			\
-	typeof(size) __size = (size);			\
-	typeof(alignment) __alignment = (alignment);	\
-	__size - (__size % __alignment);		\
-})
-#endif /* !ROUND_DOWN */
+
 int gcd(int a, int b); /* Calculate greatest common divisor for a and b */
 
 /* This is a divide function that returns ceil of the quotient.