diff --git a/Makefile b/Makefile
index 386f38f..e7a4ddc 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 LDLIBS = -lraylib
 CXXFLAGS += -Wall -Wextra -pedantic -Werror
 
-pong: main.o paddle.hpp ball.hpp
+pong: main.o paddle.hpp ball.hpp math-helpers.hpp
 	g++ $(CXXFLAGS) main.o -o pong $(LDLIBS)
 
 main.o : main.cpp