diff --git a/src/pca9685/pca9685.cxx b/src/pca9685/pca9685.cxx
index 1b4e9bf3..900b4c99 100644
--- a/src/pca9685/pca9685.cxx
+++ b/src/pca9685/pca9685.cxx
@@ -182,9 +182,9 @@ bool PCA9685::ledFullOn(uint8_t led, bool val)
   uint8_t bits = readByte(regoff);
 
   if (val)
-    bits |= ((1 << 4) & 0xff);
+    bits |= 0x10;
   else
-    bits &= ~((1 << 4) & 0xff);
+    bits &= ~0x10;
 
   return writeByte(regoff, bits);
 }
@@ -209,9 +209,9 @@ bool PCA9685::ledFullOff(uint8_t led, bool val)
   uint8_t bits = readByte(regoff);
 
   if (val)
-    bits |= ((1 << 4) & 0xff);
+    bits |= 0x10;
   else
-    bits &= ~((1 << 4) & 0xff);
+    bits &= ~0x10;
 
   return writeByte(regoff, bits);
 }
@@ -240,7 +240,7 @@ bool PCA9685::ledOnTime(uint8_t led, uint16_t time)
     regoff = REG_LED0_ON_L + (led * 4);
 
   // we need to preserve the full ON bit in *_ON_H
-  uint8_t onbit = (readByte(regoff + 1) & 0x40);
+  uint8_t onbit = (readByte(regoff + 1) & 0x10);
 
   time = (time & 0x0fff) | (onbit << 8);
 
@@ -271,7 +271,7 @@ bool PCA9685::ledOffTime(uint8_t led, uint16_t time)
     regoff = REG_LED0_ON_L + (led * 4) + 2;
 
   // we need to preserve the full OFF bit in *_OFF_H
-  uint8_t offbit = (readByte(regoff + 1) & 0x40);
+  uint8_t offbit = (readByte(regoff + 1) & 0x10);
 
   time = (time & 0x0fff) | (offbit << 8);