diff --git a/tests/Makefile b/tests/Makefile
index 561051f..34c8f9b 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,7 +1,7 @@
 32:
-	$(CC) -m32 stb_vorbis.c test_c_compilation.c
-	$(CC) -m32 stb_vorbis.c test_cpp_compilation.cpp
+	$(CC) -m32 -I.. ../stb_vorbis.c test_c_compilation.c
+	$(CC) -m32 -I.. ../stb_vorbis.c test_cpp_compilation.cpp
 
 64:
-	$(CC) -m64 stb_vorbis.c test_c_compilation.c
-	$(CC) -m64 stb_vorbis.c test_cpp_compilation.cpp
+	$(CC) -m64 -I.. ../stb_vorbis.c test_c_compilation.c
+	$(CC) -m64 -I.. ../stb_vorbis.c test_cpp_compilation.cpp