diff --git a/IO_PCA9685.cpp b/IO_PCA9685.cpp
index 25b0745..71f3661 100644
--- a/IO_PCA9685.cpp
+++ b/IO_PCA9685.cpp
@@ -45,7 +45,7 @@ void PCA9685::create(VPIN firstVpin, int nPins, I2CAddress i2cAddress, uint16_t
 bool PCA9685::_configure(VPIN vpin, ConfigTypeEnum configType, int paramCount, int params[]) {
   if (configType != CONFIGURE_SERVO) return false;
   if (paramCount != 5) return false;
-  #if DIAG_IO >= 3
+  #ifdef DIAG_IO
   DIAG(F("PCA9685 Configure VPIN:%d Apos:%d Ipos:%d Profile:%d Duration:%d state:%d"), 
     vpin, params[0], params[1], params[2], params[3], params[4]);
   #endif
@@ -117,7 +117,7 @@ void PCA9685::_begin() {
 // Device-specific write function, invoked from IODevice::write().  
 // For this function, the configured profile is used.
 void PCA9685::_write(VPIN vpin, int value) {
-  #if DIAG_IO >= 3
+  #ifdef DIAG_IO
   DIAG(F("PCA9685 Write Vpin:%d Value:%d"), vpin, value);
   #endif
   int pin = vpin - _firstVpin;
@@ -144,7 +144,7 @@ void PCA9685::_write(VPIN vpin, int value) {
 //             4 (Bounce)  Servo 'bounces' at extremes.
 //            
 void PCA9685::_writeAnalogue(VPIN vpin, int value, uint8_t profile, uint16_t duration) {
-  #if DIAG_IO >= 3
+  #ifdef DIAG_IO
   DIAG(F("PCA9685 WriteAnalogue Vpin:%d Value:%d Profile:%d Duration:%d %S"), 
     vpin, value, profile, duration, _deviceState == DEVSTATE_FAILED?F("DEVSTATE_FAILED"):F(""));
   #endif
diff --git a/IO_PCA9685pwm.h b/IO_PCA9685pwm.h
index d950bbf..042516b 100644
--- a/IO_PCA9685pwm.h
+++ b/IO_PCA9685pwm.h
@@ -120,7 +120,7 @@ private:
   //            
   void _writeAnalogue(VPIN vpin, int value, uint8_t param1, uint16_t param2) override {
     (void)param1; (void)param2;  // suppress compiler warning
-    #if DIAG_IO >= 3
+    #ifdef DIAG_IO
     DIAG(F("PCA9685pwm WriteAnalogue Vpin:%d Value:%d %S"), 
       vpin, value, _deviceState == DEVSTATE_FAILED?F("DEVSTATE_FAILED"):F(""));
     #endif
@@ -141,7 +141,7 @@ private:
   // writeDevice (helper function) takes a pin in range 0 to _nPins-1 within the device, and a value
   // between 0 and 4095 for the PWM mark-to-period ratio, with 4095 being 100%.
   void writeDevice(uint8_t pin, int value) {
-    #if DIAG_IO >= 3
+    #ifdef DIAG_IO
     DIAG(F("PCA9685pwm I2C:%s WriteDevice Pin:%d Value:%d"), _I2CAddress.toString(), pin, value);
     #endif
     // Wait for previous request to complete