diff --git a/configs/olimex-lpc1766stk/nsh/defconfig b/configs/olimex-lpc1766stk/nsh/defconfig
index 31ea6858dc..7643514181 100644
--- a/configs/olimex-lpc1766stk/nsh/defconfig
+++ b/configs/olimex-lpc1766stk/nsh/defconfig
@@ -204,8 +204,8 @@ CONFIG_LPC17_SSP1=y
 #
 CONFIG_PHY_AUTONEG=y
 CONFIG_NET_EMACRAM_SIZE=8192
-CONFIG_NET_NTXDESC=7
-CONFIG_NET_NRXDESC=7
+CONFIG_NET_NTXDESC=6
+CONFIG_NET_NRXDESC=6
 # CONFIG_NET_WOL is not set
 # CONFIG_NET_HASH is not set
 # CONFIG_NET_MULTICAST is not set
@@ -417,7 +417,7 @@ CONFIG_SPI=y
 # CONFIG_SPI_OWNBUS is not set
 # CONFIG_SPI_EXCHANGE is not set
 # CONFIG_SPI_CMDDATA is not set
-CONFIG_SPI_CALLBACK=y
+# CONFIG_SPI_CALLBACK is not set
 # CONFIG_SPI_BITBANG is not set
 # CONFIG_I2S is not set
 
diff --git a/configs/olimex-lpc1766stk/src/lpc17_ssp.c b/configs/olimex-lpc1766stk/src/lpc17_ssp.c
index ab5f208de2..3a4880c0ee 100644
--- a/configs/olimex-lpc1766stk/src/lpc17_ssp.c
+++ b/configs/olimex-lpc1766stk/src/lpc17_ssp.c
@@ -43,6 +43,7 @@
 #include <stdbool.h>
 #include <debug.h>
 
+#include <nuttx/arch.h>
 #include <nuttx/spi/spi.h>
 #ifdef CONFIG_SPI_CALLBACK
 #include <nuttx/irq.h>
@@ -167,6 +168,8 @@ static void ssp_cdirqsetup(int irq, xcpt_t irqhandler)
       up_disable_irq(irq);
       (void)irq_detach(irq);
     }
+
+  irqrestore(flags);
 }
 #endif