diff --git a/src/util/vfs.c b/src/util/vfs.c
index ac8fe4c34..7902d55c0 100644
--- a/src/util/vfs.c
+++ b/src/util/vfs.c
@@ -24,7 +24,7 @@ static bool _vfdClose(struct VFile* vf);
 static off_t _vfdSeek(struct VFile* vf, off_t offset, int whence);
 static ssize_t _vfdRead(struct VFile* vf, void* buffer, size_t size);
 static ssize_t _vfdReadline(struct VFile* vf, char* buffer, size_t size);
-static ssize_t _vfdWrite(struct VFile* vf, void* buffer, size_t size);
+static ssize_t _vfdWrite(struct VFile* vf, const void* buffer, size_t size);
 static void* _vfdMap(struct VFile* vf, size_t size, int flags);
 static void _vfdUnmap(struct VFile* vf, void* memory, size_t size);
 static void _vfdTruncate(struct VFile* vf, size_t size);
@@ -96,7 +96,7 @@ ssize_t _vfdReadline(struct VFile* vf, char* buffer, size_t size) {
 	return buffer[bytesRead] = '\0';
 }
 
-ssize_t _vfdWrite(struct VFile* vf, void* buffer, size_t size) {
+ssize_t _vfdWrite(struct VFile* vf, const void* buffer, size_t size) {
 	struct VFileFD* vfd = (struct VFileFD*) vf;
 	return write(vfd->fd, buffer, size);
 }
diff --git a/src/util/vfs.h b/src/util/vfs.h
index 853de9058..cea38aedf 100644
--- a/src/util/vfs.h
+++ b/src/util/vfs.h
@@ -13,7 +13,7 @@ struct VFile {
 	off_t (*seek)(struct VFile* vf, off_t offset, int whence);
 	ssize_t (*read)(struct VFile* vf, void* buffer, size_t size);
 	ssize_t (*readline)(struct VFile* vf, char* buffer, size_t size);
-	ssize_t (*write)(struct VFile* vf, void* buffer, size_t size);
+	ssize_t (*write)(struct VFile* vf, const void* buffer, size_t size);
 	void* (*map)(struct VFile* vf, size_t size, int flags);
 	void (*unmap)(struct VFile* vf, void* memory, size_t size);
 	void (*truncate)(struct VFile* vf, size_t size);
diff --git a/src/util/vfs/vfs-zip.c b/src/util/vfs/vfs-zip.c
index 0a5d34406..21f703690 100644
--- a/src/util/vfs/vfs-zip.c
+++ b/src/util/vfs/vfs-zip.c
@@ -34,7 +34,7 @@ static bool _vfzClose(struct VFile* vf);
 static off_t _vfzSeek(struct VFile* vf, off_t offset, int whence);
 static ssize_t _vfzRead(struct VFile* vf, void* buffer, size_t size);
 static ssize_t _vfzReadline(struct VFile* vf, char* buffer, size_t size);
-static ssize_t _vfzWrite(struct VFile* vf, void* buffer, size_t size);
+static ssize_t _vfzWrite(struct VFile* vf, const void* buffer, size_t size);
 static void* _vfzMap(struct VFile* vf, size_t size, int flags);
 static void _vfzUnmap(struct VFile* vf, void* memory, size_t size);
 static void _vfzTruncate(struct VFile* vf, size_t size);
@@ -194,7 +194,7 @@ ssize_t _vfzReadline(struct VFile* vf, char* buffer, size_t size) {
 	return buffer[bytesRead] = '\0';
 }
 
-ssize_t _vfzWrite(struct VFile* vf, void* buffer, size_t size) {
+ssize_t _vfzWrite(struct VFile* vf, const void* buffer, size_t size) {
 	// TODO
 	UNUSED(vf);
 	UNUSED(buffer);