diff --git a/CMakeLists.txt b/CMakeLists.txt
index f51e339..7ee872d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,7 +27,7 @@ pico_sdk_init()
  
 file(GLOB_RECURSE DAISYSP_SOURCES "${CMAKE_CURRENT_LIST_DIR}/daisysp/**/*.cpp")
  
-add_executable(sint-gauntlet ${DAISYSP_SOURCES} main.cc buttons.c mux.c pwm.c vco.c)
+add_executable(sint-gauntlet ${DAISYSP_SOURCES} main.c buttons.c mux.c pwm.c vco.c)
  
 pico_set_program_name(sint-gauntlet "sint-gauntlet")
 pico_set_program_version(sint-gauntlet "0.1")
@@ -64,6 +64,7 @@ target_link_libraries(sint-gauntlet
         hardware_clocks
         hardware_pwm
         hardware_adc
+	pico_multicore
         )
  
 pico_add_extra_outputs(sint-gauntlet)