diff --git a/makefile b/makefile
index 92e7986..2921241 100644
--- a/makefile
+++ b/makefile
@@ -127,7 +127,7 @@ myapp: myapp.o libic.a
 	$(CC) $^ $(LDFLAGS) -o myapp
 
 mycpp: mycpp.o libic.a
-	$(CXX) $^ $(LDFLAGS) -o mycpp
+	$(CXX) $^ $(LDFLAGS) -lpthread -o mycpp
 
 .c.o:
 	$(CC) -O3 $(CFLAGS) $< -c -o $@