diff --git a/sys/alpha/include/param.h b/sys/alpha/include/param.h
index 04828fa7737..f32b749e5ab 100644
--- a/sys/alpha/include/param.h
+++ b/sys/alpha/include/param.h
@@ -151,10 +151,6 @@
 #endif	/* MCLSHIFT */
 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a mbuf cluster */
 
-/* pages ("clicks") to disk blocks */
-#define	ctod(x)		((x) << (PAGE_SHIFT - DEV_BSHIFT))
-#define	dtoc(x)		((x) >> (PAGE_SHIFT - DEV_BSHIFT))
-
 /* pages to bytes */
 #define	ctob(x)		((x) << PAGE_SHIFT)
 #define	btoc(x)		(((x) + PAGE_MASK) >> PAGE_SHIFT)
diff --git a/sys/arm/include/param.h b/sys/arm/include/param.h
index 7dda79df92e..5a743cc32e7 100644
--- a/sys/arm/include/param.h
+++ b/sys/arm/include/param.h
@@ -136,10 +136,6 @@
 /* bytes to clicks */
 #define	btoc(x)		(((unsigned)(x) + PAGE_MASK) >> PAGE_SHIFT)
 
-/* pages ("clicks") to disk blocks */
-#define	ctod(x)		((x) << (PAGE_SHIFT - DEV_BSHIFT))
-#define	dtoc(x)		((x) >> (PAGE_SHIFT - DEV_BSHIFT))
-
 /* bytes to disk blocks */
 /*
  * btodb() is messy and perhaps slow because `bytes' may be an off_t.  We
diff --git a/sys/ia64/include/param.h b/sys/ia64/include/param.h
index a516325839a..dff273e57af 100644
--- a/sys/ia64/include/param.h
+++ b/sys/ia64/include/param.h
@@ -177,10 +177,6 @@
 #define	NKMEMCLUSTERS	(4096*1024/CLBYTES)	/* XXX? */
 #endif
 
-/* pages ("clicks") to disk blocks */
-#define	ctod(x)		((x) << (PAGE_SHIFT - DEV_BSHIFT))
-#define	dtoc(x)		((x) >> (PAGE_SHIFT - DEV_BSHIFT))
-
 /* pages to bytes */
 #define	ctob(x)		((x) << PAGE_SHIFT)
 #define	btoc(x)		(((x) + PAGE_MASK) >> PAGE_SHIFT)
diff --git a/sys/powerpc/include/param.h b/sys/powerpc/include/param.h
index 25a92052b40..81bc3db9385 100644
--- a/sys/powerpc/include/param.h
+++ b/sys/powerpc/include/param.h
@@ -144,10 +144,6 @@
 /* bytes to clicks */
 #define	btoc(x)		(((unsigned)(x) + PAGE_MASK) >> PAGE_SHIFT)
 
-/* pages ("clicks") to disk blocks */
-#define	ctod(x)		((x) << (PAGE_SHIFT - DEV_BSHIFT))
-#define	dtoc(x)		((x) >> (PAGE_SHIFT - DEV_BSHIFT))
-
 /* bytes to disk blocks */
 /*
  * btodb() is messy and perhaps slow because `bytes' may be an off_t.  We