diff --git a/setup.py b/setup.py
index 0703fb6..3c6296e 100644
--- a/setup.py
+++ b/setup.py
@@ -32,5 +32,5 @@ setup(name             = 'CHIP_IO',
       packages         = find_packages(),
       ext_modules      = [Extension('CHIP_IO.GPIO', ['source/py_gpio.c', 'source/event_gpio.c', 'source/constants.c', 'source/common.c'], extra_compile_args=['-Wno-format-security']),
                           Extension('CHIP_IO.PWM', ['source/py_pwm.c', 'source/c_pwm.c', 'source/constants.c', 'source/common.c'], extra_compile_args=['-Wno-format-security']),
-                          Extension('CHIP_IO.SOFTPWM', ['source/py_softpwm.c', 'source/c_softpwm.c', 'source/constants.c', 'source/common.c'], extra_compile_args=['-Wno-format-security'])]) #,
+                          Extension('CHIP_IO.SOFTPWM', ['source/py_softpwm.c', 'source/c_softpwm.c', 'source/constants.c', 'source/common.c', 'source/event_gpio.c'], extra_compile_args=['-Wno-format-security'])]) #,
 #                          Extension('CHIP_IO.ADC', ['source/py_adc.c', 'source/c_adc.c', 'source/constants.c', 'source/common.c'], extra_compile_args=['-Wno-format-security']),