diff --git a/Makefile b/Makefile
index 077faa9..7490f6b 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ CXXFLAGS = -Wall -O3
 kdtree: main.o
 	$(CXX) $(CXXFLAGS) -o kdtree.out main.o
 
-main.o: main.cpp kdtree.h
+main.o: main.cpp kdtree.h geometry.h
 	$(CXX) $(CXXFLAGS) -c main.cpp
 
 clean :