1 files changed, 2 insertions, 0 deletions
diff --git a/cores/arduino/WProgram.h b/cores/arduino/WProgram.h
index 206cdac..1fba738 100755
--- a/cores/arduino/WProgram.h
+++ b/cores/arduino/WProgram.h
@@ -10,6 +10,8 @@
 #ifdef __cplusplus
 #include "HardwareSerial.h"
 
+unsigned long pulseIn(uint8_t pin, uint8_t state, unsigned long timeout = 1000000L);
+
 // WMath prototypes
 long random(long);
 long random(long, long);