diff --git a/ion/Makefile b/ion/Makefile
index 595b2a67a..f228308f7 100644
--- a/ion/Makefile
+++ b/ion/Makefile
@@ -1,6 +1,10 @@
 SFLAGS += -Iion/include -DKD_CONFIG_H=1
 include ion/src/$(PLATFORM)/Makefile
 
+objs += $(addprefix ion/src/, \
+  c.o \
+)
+
 tests += $(addprefix ion/test/,\
   crc32.cpp\
 )
diff --git a/ion/include/ion/c.h b/ion/include/ion/c.h
index 5bfacf3ae..ce2ce1b98 100644
--- a/ion/include/ion/c.h
+++ b/ion/include/ion/c.h
@@ -5,10 +5,10 @@
 extern "C" {
 #endif
 
-void ion_log_print(const char * message) {
+void ion_log_print(const char * message);
 
 #ifdef __cplusplus
-extern "C" {
+}
 #endif
 
 #endif
diff --git a/ion/src/simulator/Makefile b/ion/src/simulator/Makefile
index 5091f72c7..83ff56b48 100644
--- a/ion/src/simulator/Makefile
+++ b/ion/src/simulator/Makefile
@@ -10,6 +10,7 @@ objs += $(addprefix ion/src/shared/, \
   crc32.o \
   events.o \
   events_from_keyboard.o \
+  log.o \
   power.o \
 )