diff --git a/arch/arm/src/arm/pg_macros.h b/arch/arm/src/arm/pg_macros.h
index 4990937810..fc50f61460 100644
--- a/arch/arm/src/arm/pg_macros.h
+++ b/arch/arm/src/arm/pg_macros.h
@@ -281,9 +281,14 @@
 
 /* This is the total number of pages used in the text/data mapping: */
 
-#define PG_TOTAL_NPPAGES        (PG_TEXT_NPPAGES + PG_DATA_PAGES + PG_PGTABLE_NPAGES)
-#define PG_TOTAL_NVPAGES        (PG_TEXT_NVPAGES + PG_DATA_PAGES + PG_PGTABLE_NPAGES)
-#if PG_TOTAL_NPPAGES >PG_RAM_PAGES
+#define PG_TOTAL_NPPAGES        (PG_TEXT_NPPAGES + PG_DATA_NPAGES + PG_PGTABLE_NPAGES)
+#define PG_TOTAL_NVPAGES        (PG_TEXT_NVPAGES + PG_DATA_NPAGES + PG_PGTABLE_NPAGES)
+#define PG_TOTAL_PSIZE          (PG_TOTAL_NPPAGES << PAGESHIFT)
+#define PG_TOTAL_VSIZE          (PG_TOTAL_NVPAGES << PAGESHIFT)
+
+/* Sanity check: */
+
+#if PG_TOTAL_NPPAGES > PG_RAM_PAGES
 #  error "Total pages required exceeds RAM size"
 #endif
 
diff --git a/arch/arm/src/lpc313x/lpc313x_allocateheap.c b/arch/arm/src/lpc313x/lpc313x_allocateheap.c
index e6b587fd36..79ba8464ef 100755
--- a/arch/arm/src/lpc313x/lpc313x_allocateheap.c
+++ b/arch/arm/src/lpc313x/lpc313x_allocateheap.c
@@ -51,6 +51,11 @@
 #include "up_internal.h"
 #include "lpc313x_memorymap.h"
 
+#ifdef CONFIG_PAGING
+#  include <nuttx/page.h>
+#  include "pg_macros.h"
+#endif
+
 /************************************************************************
  * Pre-processor Definitions
  ************************************************************************/
@@ -121,10 +126,18 @@
  * will let the heap run all the way to the end of SRAM.
  */
 
-#ifdef PGTABLE_IN_HIGHSRAM
-#  define LPC313X_HEAP_VEND (LPC313X_INTSRAM_VSECTION + LPC313X_ISRAM_SIZE - PGTABLE_SIZE)  
+#ifdef CONFIG_PAGING
+#  ifdef PGTABLE_IN_HIGHSRAM
+#    define LPC313X_HEAP_VEND (PG_LOCKED_VBASE + PG_TOTAL_VSIZE - PGTABLE_SIZE)  
+#  else
+#    define LPC313X_HEAP_VEND (PG_LOCKED_VBASE + PG_TOTAL_VSIZE)  
+#  endif
 #else
-#  define LPC313X_HEAP_VEND (LPC313X_INTSRAM_VSECTION + LPC313X_ISRAM_SIZE)  
+#  ifdef PGTABLE_IN_HIGHSRAM
+#    define LPC313X_HEAP_VEND (LPC313X_INTSRAM_VSECTION + LPC313X_ISRAM_SIZE - PGTABLE_SIZE)  
+#  else
+#    define LPC313X_HEAP_VEND (LPC313X_INTSRAM_VSECTION + LPC313X_ISRAM_SIZE)  
+#  endif
 #endif
 
 /************************************************************************