diff --git a/src/sdnative.c b/src/sdnative.c
index fbdcb90..d1f67e5 100644
--- a/src/sdnative.c
+++ b/src/sdnative.c
@@ -974,6 +974,7 @@ void sdn_init(void) {
   BITBAND(SD_CLKREG->FIODIR, SD_CLKPIN) = 1;
   BITBAND(SD_CMDREG->FIODIR, SD_CMDPIN) = 1;
   BITBAND(SD_CMDREG->FIOPIN, SD_CMDPIN) = 1;
+  LPC_PINCON->PINMODE0 &= ~(BV(14) | BV(15));
   LPC_GPIO2->FIOPIN0 = 0x00;
   LPC_GPIO2->FIOMASK0 = ~0xf;
 }