diff --git a/makefile b/makefile
index 46653d2..c310c49 100644
--- a/makefile
+++ b/makefile
@@ -9,8 +9,8 @@ LFLAGS	 =
 all: $(OBJS)
 	$(CC) -g $(OBJS) -o $(OUT) $(LFLAGS)
 
-main.o: main.c
-	$(CC) $(FLAGS) main.c 
+main.o: main.cpp
+	$(CC) $(FLAGS) main.cpp
 
 macioserial.o: macioserial.cpp
 	$(CC) $(FLAGS) macioserial.cpp