diff --git a/Makefile b/Makefile
index 5c6e9df..cda8177 100644
--- a/Makefile
+++ b/Makefile
@@ -7,13 +7,13 @@ target/test: target/build/tests/test_tensor.o target/build/tests/main.o target/b
 	cc $^ -o target/test
 
 target/build/tests/main.o: tests/main.c
-	cc -c $? -o $@ -pedantic -Wall -Wextra
+	cc -c $< -o $@ -pedantic -Wall -Wextra
 
-target/build/tests/test_tensor.o: tests/test_tensor.c
-	cc -c $? -o $@ -pedantic -Wall -Wextra
+target/build/tests/test_tensor.o: tests/test_tensor.c tests/test_tensor.h
+	cc -c $< -o $@ -pedantic -Wall -Wextra
 
-target/build/tensor.o: tensor.c
-	cc -c $? -o $@ -pedantic -Wall -Wextra
+target/build/tensor.o: tensor.c tensor.h
+	cc -c $< -o $@ -pedantic -Wall -Wextra
 
 init:
 	mkdir -p ./target/build/tests