diff --git a/libc/audio/lib_buffer.c b/libc/audio/lib_buffer.c
index 0cd3bd9a0a..036fb0e63a 100644
--- a/libc/audio/lib_buffer.c
+++ b/libc/audio/lib_buffer.c
@@ -49,10 +49,11 @@
 #include <errno.h>
 #include <debug.h>
 
-#include <nuttx/kmalloc.h>
 #include <nuttx/audio/audio.h>
 #include <nuttx/usb/audio.h>
 
+#include "lib_internal.h"
+
 #if defined(CONFIG_AUDIO)
 
 /****************************************************************************
@@ -113,7 +114,7 @@ static void apb_semtake(FAR struct ap_buffer_s *apb)
  *
  ****************************************************************************/
 
-int apb_alloc(FAR struct audio_buf_desc_s * bufdesc)
+int apb_alloc(FAR struct audio_buf_desc_s *bufdesc)
 {
   uint32_t            bufsize;
   int                 ret;
@@ -124,13 +125,15 @@ int apb_alloc(FAR struct audio_buf_desc_s * bufdesc)
   /* Perform a user mode allocation */
 
   bufsize = sizeof(struct ap_buffer_s) + bufdesc->numbytes;
-  pBuf = kumalloc(bufsize);
+  pBuf = lib_umalloc(bufsize);
   *bufdesc->u.ppBuffer = pBuf;
 
   /* Test if the allocation was successful or not */
 
   if (*bufdesc->u.ppBuffer == NULL)
-    ret = -ENOMEM;
+    {
+      ret = -ENOMEM;
+    }
   else
     {
       /* Populate the buffer contents */
@@ -158,7 +161,7 @@ int apb_alloc(FAR struct audio_buf_desc_s * bufdesc)
  ****************************************************************************/
 
 void apb_prepare(FAR struct ap_buffer_s *apb, int8_t allocmode, uint8_t format,
-    uint8_t subformat, apb_samp_t maxsamples)
+                 uint8_t subformat, apb_samp_t maxsamples)
 {
   /* Perform a reference count decrement and possibly release the memory */
 }
@@ -172,7 +175,7 @@ void apb_prepare(FAR struct ap_buffer_s *apb, int8_t allocmode, uint8_t format,
 
 void apb_free(FAR struct ap_buffer_s *apb)
 {
-  int   refcount;
+  int refcount;
 
   /* Perform a reference count decrement and possibly release the memory */
 
@@ -180,10 +183,10 @@ void apb_free(FAR struct ap_buffer_s *apb)
   refcount = apb->crefs--;
   apb_semgive(apb);
 
-  if (refcount == 1)
+  if (refcount <= 1)
     {
       auddbg("Freeing %p\n", apb);
-      kufree(apb);
+      lib_ufree(apb);
     }
 }
 
diff --git a/libc/lib_internal.h b/libc/lib_internal.h
index a85e815ff9..c2be50a32f 100644
--- a/libc/lib_internal.h
+++ b/libc/lib_internal.h
@@ -82,16 +82,39 @@
 
 #if defined(CONFIG_NUTTX_KERNEL) && defined(__KERNEL__)
 #  include <nuttx/kmalloc.h>
-#  define lib_malloc(s)    kmalloc(s)
-#  define lib_zalloc(s)    kzalloc(s)
-#  define lib_realloc(p,s) krealloc(p,s)
-#  define lib_free(p)      kfree(p)
+
+   /* Domain-specific allocations */
+
+#  define lib_malloc(s)     kmalloc(s)
+#  define lib_zalloc(s)     kzalloc(s)
+#  define lib_realloc(p,s)  krealloc(p,s)
+#  define lib_memalign(p,s) krealloc(p,s)
+#  define lib_free(p)       kfree(p)
+
+   /* User-accesssible allocations */
+
+#  define lib_umalloc(s)    kumalloc(s)
+#  define lib_uzalloc(s)    kuzalloc(s)
+#  define lib_urealloc(p,s) kurealloc(p,s)
+#  define lib_ufree(p)      kufree(p)
+
 #else
 #  include <stdlib.h>
-#  define lib_malloc(s)    malloc(s)
-#  define lib_zalloc(s)    zalloc(s)
-#  define lib_realloc(p,s) realloc(p,s)
-#  define lib_free(p)      free(p)
+
+   /* Domain-specific allocations */
+
+#  define lib_malloc(s)     malloc(s)
+#  define lib_zalloc(s)     zalloc(s)
+#  define lib_realloc(p,s)  realloc(p,s)
+#  define lib_free(p)       free(p)
+
+   /* User-accesssible allocations */
+
+#  define lib_umalloc(s)    malloc(s)
+#  define lib_uzalloc(s)    zalloc(s)
+#  define lib_urealloc(p,s) realloc(p,s)
+#  define lib_ufree(p)      free(p)
+
 #endif
 
 #define LIB_BUFLEN_UNKNOWN INT_MAX