diff --git a/.gitignore b/.gitignore
index aed613dc..61b1df6c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -64,6 +64,7 @@ venv/
 
 # C extensions
 src/dependency_injector/*.c
+src/dependency_injector/*.h
 src/dependency_injector/*.so
 src/dependency_injector/providers/*.c
 src/dependency_injector/providers/*.so
diff --git a/Makefile b/Makefile
index 4764cba1..f3684c28 100644
--- a/Makefile
+++ b/Makefile
@@ -15,6 +15,7 @@ clean:
 	find src -name '*.py[cod]' -delete
 	find src -name '__pycache__' -delete
 	find src -name '*.c' -delete
+	find src -name '*.h' -delete
 	find src -name '*.so' -delete
 	find src -name '*.html' -delete
 	# Clean tests
diff --git a/src/dependency_injector/providers/utils.h b/src/dependency_injector/providers/utils.h
deleted file mode 100644
index 00f08d98..00000000
--- a/src/dependency_injector/providers/utils.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/* Generated by Cython 0.25.1 */
-
-#ifndef __PYX_HAVE__dependency_injector__providers__utils
-#define __PYX_HAVE__dependency_injector__providers__utils
-
-
-#ifndef __PYX_HAVE_API__dependency_injector__providers__utils
-
-#ifndef __PYX_EXTERN_C
-  #ifdef __cplusplus
-    #define __PYX_EXTERN_C extern "C"
-  #else
-    #define __PYX_EXTERN_C extern
-  #endif
-#endif
-
-#ifndef DL_IMPORT
-  #define DL_IMPORT(_T) _T
-#endif
-
-__PYX_EXTERN_C DL_IMPORT(PyObject) *__pyx_v_19dependency_injector_9providers_5utils_CLASS_TYPES;
-
-#endif /* !__PYX_HAVE_API__dependency_injector__providers__utils */
-
-#if PY_MAJOR_VERSION < 3
-PyMODINIT_FUNC initutils(void);
-#else
-PyMODINIT_FUNC PyInit_utils(void);
-#endif
-
-#endif /* !__PYX_HAVE__dependency_injector__providers__utils */