diff --git a/src/add-ons/kernel/drivers/audio/echo/echo.cpp b/src/add-ons/kernel/drivers/audio/echo/echo.cpp
index e95be7adb6..ca5f1e8e0f 100644
--- a/src/add-ons/kernel/drivers/audio/echo/echo.cpp
+++ b/src/add-ons/kernel/drivers/audio/echo/echo.cpp
@@ -49,8 +49,6 @@ char * names[NUM_CARDS*20+1];
 
 extern device_hooks multi_hooks;
 
-uint32 round_to_pagesize(uint32 size);
-area_id map_mem(void **log, void *phy, size_t size, const char *name);
 int32 echo_int(void *arg);
 status_t init_hardware(void);
 status_t init_driver(void);
@@ -327,39 +325,6 @@ echo_stream_delete(echo_stream *stream)
 }
 
 
-uint32 round_to_pagesize(uint32 size)
-{
-	return (size + B_PAGE_SIZE - 1) & ~(B_PAGE_SIZE - 1);
-}
-
-/* This is not the most advanced method to map physical memory for io access.
- * Perhaps using B_ANY_KERNEL_ADDRESS instead of B_ANY_KERNEL_BLOCK_ADDRESS
- * makes the whole offset calculation and relocation obsolete. But the code
- * below does work, and I can't test if using B_ANY_KERNEL_ADDRESS also works.
- */
-area_id 
-map_mem(void **log, void *phy, size_t size, const char *name)
-{
-	uint32 offset;
-	void *phyadr;
-	void *mapadr;
-	area_id area;
-
-	LOG(("mapping physical address %p with %#x bytes for %s\n",phy,size,name));
-
-	offset = (uint32)phy & (B_PAGE_SIZE - 1);
-	phyadr = (void*)((uint32)phy - offset);
-	size = round_to_pagesize(size + offset);
-	area = map_physical_memory(name, phyadr, size, B_ANY_KERNEL_BLOCK_ADDRESS, B_READ_AREA | B_WRITE_AREA, &mapadr);
-	*log = (void*) ((uint32)mapadr + offset);
-
-	LOG(("physical = %p, logical = %p, offset = %#x, phyadr = %p, mapadr = %p, size = %#x, area = %#x\n",
-		phy, *log, offset, phyadr, mapadr, size, area));
-	
-	return area;
-}
-
-
 /* Echo interrupt */
 
 int32 echo_int(void *arg)
diff --git a/src/add-ons/kernel/drivers/audio/echo/util.c b/src/add-ons/kernel/drivers/audio/echo/util.c
index d71521def3..127fad7c01 100644
--- a/src/add-ons/kernel/drivers/audio/echo/util.c
+++ b/src/add-ons/kernel/drivers/audio/echo/util.c
@@ -86,3 +86,31 @@ area_id alloc_mem(void **phy, void **log, size_t size, const char *name)
 	return areaid;
 }
 
+
+/* This is not the most advanced method to map physical memory for io access.
+ * Perhaps using B_ANY_KERNEL_ADDRESS instead of B_ANY_KERNEL_BLOCK_ADDRESS
+ * makes the whole offset calculation and relocation obsolete. But the code
+ * below does work, and I can't test if using B_ANY_KERNEL_ADDRESS also works.
+ */
+area_id 
+map_mem(void **log, void *phy, size_t size, const char *name)
+{
+	uint32 offset;
+	void *phyadr;
+	void *mapadr;
+	area_id area;
+
+	LOG(("mapping physical address %p with %#x bytes for %s\n",phy,size,name));
+
+	offset = (uint32)phy & (B_PAGE_SIZE - 1);
+	phyadr = (void*)((uint32)phy - offset);
+	size = round_to_pagesize(size + offset);
+	area = map_physical_memory(name, phyadr, size, B_ANY_KERNEL_BLOCK_ADDRESS, B_READ_AREA | B_WRITE_AREA, &mapadr);
+	*log = (void*) ((uint32)mapadr + offset);
+
+	LOG(("physical = %p, logical = %p, offset = %#x, phyadr = %p, mapadr = %p, size = %#x, area = %#x\n",
+		phy, *log, offset, phyadr, mapadr, size, area));
+	
+	return area;
+}
+
diff --git a/src/add-ons/kernel/drivers/audio/echo/util.h b/src/add-ons/kernel/drivers/audio/echo/util.h
index 02fb99225f..03e3f023dc 100644
--- a/src/add-ons/kernel/drivers/audio/echo/util.h
+++ b/src/add-ons/kernel/drivers/audio/echo/util.h
@@ -34,8 +34,6 @@ extern "C" {
 
 #include <KernelExport.h>
 
-
-
 area_id alloc_mem(void **phy, void **log, size_t size, const char *name);
 
 cpu_status lock(void);
@@ -43,6 +41,8 @@ void unlock(cpu_status status);
 
 extern spinlock	slock;
 
+area_id map_mem(void **log, void *phy, size_t size, const char *name);
+
 #ifdef __cplusplus
 }
 #endif