diff --git a/arch/arm/src/sama5/sam_pio.c b/arch/arm/src/sama5/sam_pio.c
index 9c40b50740..eb280cc2e8 100644
--- a/arch/arm/src/sama5/sam_pio.c
+++ b/arch/arm/src/sama5/sam_pio.c
@@ -337,16 +337,18 @@ static inline int sam_configinput(uintptr_t base, uint32_t pin,
     }
 
 #ifdef PIO_HAVE_SCHMITT
-  /* Enable/disable the Schmitt trigger */
+  /* Enable/disable the Schmitt trigger:  Zero enables.  Schmitt triggered
+   * inputs are enabled by default.
+   */
 
   regval = getreg32(base + SAM_PIO_SCHMITT_OFFSET);
   if ((cfgset & PIO_CFG_SCHMITT) != 0)
     {
-      regval |= pin;
+      regval &= ~pin;
     }
   else
     {
-      regval &= ~pin;
+      regval |= pin;
     }
 
   putreg32(regval, base + SAM_PIO_SCHMITT_OFFSET);