diff --git a/arch/arm/src/lpc31xx/lpc31_ehci.c b/arch/arm/src/lpc31xx/lpc31_ehci.c
index bbac7edfa05..2af7e0c13ec 100755
--- a/arch/arm/src/lpc31xx/lpc31_ehci.c
+++ b/arch/arm/src/lpc31xx/lpc31_ehci.c
@@ -3813,7 +3813,7 @@ static int lpc31_ioalloc(FAR struct usbhost_driver_s *drvr, FAR uint8_t **buffer
  *   Some hardware supports special memory in which IO data can  be accessed more
  *   efficiently.  This method provides a mechanism to free that IO buffer
  *   memory.  If the underlying hardware does not support such "special" memory,
- *   this functions may simply map to kufree().
+ *   this functions may simply map to kumm_free().
  *
  * Input Parameters:
  *   drvr - The USB host driver instance obtained as a parameter from the call to
@@ -3835,7 +3835,7 @@ static int lpc31_iofree(FAR struct usbhost_driver_s *drvr, FAR uint8_t *buffer)
 
   /* No special action is require to free the I/O buffer memory */
 
-  kufree(buffer);
+  kumm_free(buffer);
   return OK;
 }
 
diff --git a/arch/arm/src/sam34/sam_udp.c b/arch/arm/src/sam34/sam_udp.c
index 4c290835ef8..4b30c4afd1b 100644
--- a/arch/arm/src/sam34/sam_udp.c
+++ b/arch/arm/src/sam34/sam_udp.c
@@ -3052,7 +3052,7 @@ static void sam_ep_freebuffer(struct usbdev_ep_s *ep, void *buf)
 {
   /* There is not special buffer allocation requirement */
 
-  kufree(buf);
+  kumm_free(buf);
 }
 #endif
 
diff --git a/arch/arm/src/sama5/sam_ehci.c b/arch/arm/src/sama5/sam_ehci.c
index 025b27e7780..f3e8e6887ff 100755
--- a/arch/arm/src/sama5/sam_ehci.c
+++ b/arch/arm/src/sama5/sam_ehci.c
@@ -3653,7 +3653,7 @@ static int sam_ioalloc(FAR struct usbhost_driver_s *drvr, FAR uint8_t **buffer,
  *   Some hardware supports special memory in which IO data can  be accessed more
  *   efficiently.  This method provides a mechanism to free that IO buffer
  *   memory.  If the underlying hardware does not support such "special" memory,
- *   this functions may simply map to kufree().
+ *   this functions may simply map to kumm_free().
  *
  * Input Parameters:
  *   drvr - The USB host driver instance obtained as a parameter from the call to
@@ -3675,7 +3675,7 @@ static int sam_iofree(FAR struct usbhost_driver_s *drvr, FAR uint8_t *buffer)
 
   /* No special action is require to free the I/O buffer memory */
 
-  kufree(buffer);
+  kumm_free(buffer);
   return OK;
 }
 
diff --git a/arch/arm/src/sama5/sam_ohci.c b/arch/arm/src/sama5/sam_ohci.c
index 28675044065..f946fb138a9 100644
--- a/arch/arm/src/sama5/sam_ohci.c
+++ b/arch/arm/src/sama5/sam_ohci.c
@@ -2715,7 +2715,7 @@ static int sam_ioalloc(FAR struct usbhost_driver_s *drvr, FAR uint8_t **buffer,
  *   Some hardware supports special memory in which IO data can  be accessed more
  *   efficiently.  This method provides a mechanism to free that IO buffer
  *   memory.  If the underlying hardware does not support such "special" memory,
- *   this functions may simply map to kufree().
+ *   this functions may simply map to kumm_free().
  *
  * Input Parameters:
  *   drvr - The USB host driver instance obtained as a parameter from the call to
@@ -2735,9 +2735,9 @@ static int sam_iofree(FAR struct usbhost_driver_s *drvr, FAR uint8_t *buffer)
 {
   DEBUGASSERT(drvr && buffer);
 
-  /* kufree is all that is required */
+  /* kumm_free is all that is required */
 
-  kufree(buffer);
+  kumm_free(buffer);
   return OK;
 }
 
diff --git a/arch/arm/src/sama5/sam_udphs.c b/arch/arm/src/sama5/sam_udphs.c
index f61f2e22198..cc6c86b1c29 100644
--- a/arch/arm/src/sama5/sam_udphs.c
+++ b/arch/arm/src/sama5/sam_udphs.c
@@ -3541,7 +3541,7 @@ static void sam_ep_freebuffer(struct usbdev_ep_s *ep, void *buf)
 {
   /* There is not special buffer allocation requirement */
 
-  kufree(buf);
+  kumm_free(buf);
 }
 #endif
 
diff --git a/arch/rgmp/src/nuttx.c b/arch/rgmp/src/nuttx.c
index 338940be347..579acab15ed 100644
--- a/arch/rgmp/src/nuttx.c
+++ b/arch/rgmp/src/nuttx.c
@@ -216,7 +216,7 @@ void up_release_stack(struct tcb_s *dtcb, uint8_t ttype)
       {
         /* Use the user-space allocator if this is a task or pthread */
 
-        kufree(dtcb->stack_alloc_ptr);
+        kumm_free(dtcb->stack_alloc_ptr);
       }
   }