diff --git a/dlls/user32/tests/cursoricon.c b/dlls/user32/tests/cursoricon.c
index a7c3ca47599..9540f3d8dde 100644
--- a/dlls/user32/tests/cursoricon.c
+++ b/dlls/user32/tests/cursoricon.c
@@ -955,14 +955,14 @@ static void test_CreateIcon(void)
 
 /* Shamelessly ripped from dlls/oleaut32/tests/olepicture.c */
 /* 1x1 pixel gif */
-static unsigned char gifimage[35] = {
+static const unsigned char gifimage[35] = {
 0x47,0x49,0x46,0x38,0x37,0x61,0x01,0x00,0x01,0x00,0x80,0x00,0x00,0xff,0xff,0xff,
 0xff,0xff,0xff,0x2c,0x00,0x00,0x00,0x00,0x01,0x00,0x01,0x00,0x00,0x02,0x02,0x44,
 0x01,0x00,0x3b
 };
 
 /* 1x1 pixel jpg */
-static unsigned char jpgimage[285] = {
+static const unsigned char jpgimage[285] = {
 0xff,0xd8,0xff,0xe0,0x00,0x10,0x4a,0x46,0x49,0x46,0x00,0x01,0x01,0x01,0x01,0x2c,
 0x01,0x2c,0x00,0x00,0xff,0xdb,0x00,0x43,0x00,0x05,0x03,0x04,0x04,0x04,0x03,0x05,
 0x04,0x04,0x04,0x05,0x05,0x05,0x06,0x07,0x0c,0x08,0x07,0x07,0x07,0x07,0x0f,0x0b,
@@ -984,7 +984,7 @@ static unsigned char jpgimage[285] = {
 };
 
 /* 1x1 pixel png */
-static unsigned char pngimage[285] = {
+static const unsigned char pngimage[285] = {
 0x89,0x50,0x4e,0x47,0x0d,0x0a,0x1a,0x0a,0x00,0x00,0x00,0x0d,0x49,0x48,0x44,0x52,
 0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x01,0x08,0x02,0x00,0x00,0x00,0x90,0x77,0x53,
 0xde,0x00,0x00,0x00,0x09,0x70,0x48,0x59,0x73,0x00,0x00,0x0b,0x13,0x00,0x00,0x0b,
@@ -1005,14 +1005,14 @@ static unsigned char bmpimage[70] = {
 };
 
 /* 1x1 pixel bmp using BITMAPCOREHEADER */
-static unsigned char bmpcoreimage[38] = {
+static const unsigned char bmpcoreimage[38] = {
 0x42,0x4d,0x26,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x22,0x00,0x00,0x00,0x0c,0x00,
 0x00,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0xff,0xff,0xff,0x00,0x55,0x55,
 0x55,0x00,0x00,0x00,0x00,0x00
 };
 
 /* 2x2 pixel gif */
-static unsigned char gif4pixel[42] = {
+static const unsigned char gif4pixel[42] = {
 0x47,0x49,0x46,0x38,0x37,0x61,0x02,0x00,0x02,0x00,0xa1,0x00,0x00,0x00,0x00,0x00,
 0x39,0x62,0xfc,0xff,0x1a,0xe5,0xff,0xff,0xff,0x2c,0x00,0x00,0x00,0x00,0x02,0x00,
 0x02,0x00,0x00,0x02,0x03,0x14,0x16,0x05,0x00,0x3b
@@ -1059,7 +1059,7 @@ static void test_LoadImageBitmap(const char * test_desc, HBITMAP hbm)
     ok(color_match(pixel, 0x00ffffff), "%s: Pixel is 0x%08x\n", test_desc, pixel);
 }
 
-static void test_LoadImageFile(const char * test_desc, unsigned char * image_data,
+static void test_LoadImageFile(const char * test_desc, const unsigned char * image_data,
     unsigned int image_size, const char * ext, BOOL expect_success)
 {
     HANDLE handle;