diff --git a/images.h b/images.h
index 6c16ae2..03390c8 100644
--- a/images.h
+++ b/images.h
@@ -49,6 +49,7 @@ int image_new_shared(int width, int height, Image* img);
 void image_destroy_shared(Image img);
 
 void* create_shared_memory(size_t size);
+void  free_shared_memory(void* ptr, size_t size);
 
 #include "src/images.c"
 #include "src/bmp-format.c"
diff --git a/src/multithreading.c b/src/multithreading.c
index 589f507..c5cca94 100644
--- a/src/multithreading.c
+++ b/src/multithreading.c
@@ -40,4 +40,8 @@ void* create_shared_memory(size_t size) {
   // The remaining parameters to `mmap()` are not important for this use case,
   // but the manpage for `mmap` explains their purpose.
   return mmap(NULL, size, protection, visibility, -1, 0);
+}
+
+void free_shared_memory(void* ptr, size_t size) {
+    munmap(ptr, size);
 }
\ No newline at end of file