diff --git a/selfpatch/CMakeLists.txt b/selfpatch/CMakeLists.txt
index 4771ad7..3bfe872 100644
--- a/selfpatch/CMakeLists.txt
+++ b/selfpatch/CMakeLists.txt
@@ -1,4 +1,4 @@
-add_library(spslr_selfpatch STATIC src/selfpatch.cpp)
+add_library(spslr_selfpatch STATIC src/selfpatch.c)
 
 target_include_directories(spslr_selfpatch PUBLIC
 	$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
diff --git a/selfpatch/include/spslr.h b/selfpatch/include/spslr.h
new file mode 100644
index 0000000..22068b3
--- /dev/null
+++ b/selfpatch/include/spslr.h
@@ -0,0 +1,6 @@
+#ifndef SPSLR_SELFPATCH_H
+#define SPSLR_SELFPATCH_H
+
+void spslr_selfpatch();
+
+#endif
diff --git a/selfpatch/src/selfpatch.c b/selfpatch/src/selfpatch.c
new file mode 100644
index 0000000..9d50fa7
--- /dev/null
+++ b/selfpatch/src/selfpatch.c
@@ -0,0 +1,6 @@
+#include <spslr.h>
+#include <stdio.h>
+
+void spslr_selfpatch() {
+	printf("SPSLR -> selfpatch()\n");
+}
diff --git a/selfpatch/src/selfpatch.cpp b/selfpatch/src/selfpatch.cpp
deleted file mode 100644
index e69de29..0000000
diff --git a/subject/main.c b/subject/main.c
index 737d062..260ce9c 100644
--- a/subject/main.c
+++ b/subject/main.c
@@ -1,3 +1,5 @@
+#include <spslr.h>
+
 #include "task_struct.h"
 
 int second_pid();
@@ -7,6 +9,8 @@ struct task_struct global = { .pid = 42, .comm = "main_global" };
 
 int main(void)
 {
+	spslr_selfpatch();
+
     struct list_head task_list;
     INIT_LIST_HEAD(&task_list);