diff --git a/arch/arm/src/lpc43xx/lpc43_irq.c b/arch/arm/src/lpc43xx/lpc43_irq.c
index 73ca6d3bc7..892b2c48a0 100644
--- a/arch/arm/src/lpc43xx/lpc43_irq.c
+++ b/arch/arm/src/lpc43xx/lpc43_irq.c
@@ -246,18 +246,45 @@ static int lpc43_irqinfo(int irq, uintptr_t *regaddr, uint32_t *bit,
 
   if (irq >= LPC43_IRQ_EXTINT)
     {
+      /* NOTE: We assume that there are at least 32 interrupts */
+
       if (irq < (LPC43_IRQ_EXTINT + 32))
         {
+           /* Interrupt in range {0-31} */
+
            *regaddr = (NVIC_IRQ0_31_ENABLE + offset);
            *bit     = 1 << (irq - LPC43_IRQ_EXTINT);
         }
-      else if (irq < LPC43M4_IRQ_NIRQS)
+#if LPC43M4_IRQ_NIRQS > 95
+#  error Extension to interrupt logic needed
+#elif LPC43M4_IRQ_NIRQS > 63
+      else if (irq < (LPC43_IRQ_EXTINT + 64))
         {
+           /* Interrupt in range {32-63} */
+
            *regaddr = (NVIC_IRQ32_63_ENABLE + offset);
            *bit     = 1 << (irq - LPC43_IRQ_EXTINT - 32);
         }
+      else if (irq < LPC43M4_IRQ_NIRQS)
+        {
+           /* Interrupt in range {64-LPC43M4_IRQ_NIRQS}, LPC43M4_IRQ_NIRQS <= 95 */
+
+           *regaddr = (NVIC_IRQ64_95_ENABLE + offset);
+           *bit     = 1 << (irq - LPC43_IRQ_EXTINT - 64);
+        }
+#else /* if LPC43M4_IRQ_NIRQS > 31 */
+      else if (irq < LPC43M4_IRQ_NIRQS)
+        {
+           /* Interrupt in range {32-LPC43M4_IRQ_NIRQS}, LPC43M4_IRQ_NIRQS <= 63 */
+
+           *regaddr = (NVIC_IRQ32_63_ENABLE + offset);
+           *bit     = 1 << (irq - LPC43_IRQ_EXTINT - 32);
+        }
+#endif
       else
         {
+           /* Interrupt >= LPC43M4_IRQ_NIRQS */
+
           return ERROR; /* Invalid interrupt */
         }
     }