diff --git a/common/endian.h b/common/endian.h
index a6b80f2451b7..fad9f3ccae80 100644
--- a/common/endian.h
+++ b/common/endian.h
@@ -573,15 +573,31 @@ inline uint32 READ_LE_UINT24(const void *ptr) {
 	return (b[2] << 16) | (b[1] << 8) | (b[0]);
 }
 
+inline void WRITE_LE_UINT24(void *ptr, uint32 value) {
+	uint8 *b = (uint8 *)ptr;
+	b[0] = (uint8)(value >> 0);
+	b[1] = (uint8)(value >> 8);
+	b[2] = (uint8)(value >> 16);
+}
+
 inline uint32 READ_BE_UINT24(const void *ptr) {
 	const uint8 *b = (const uint8 *)ptr;
 	return (b[0] << 16) | (b[1] << 8) | (b[2]);
 }
 
+inline void WRITE_BE_UINT24(void *ptr, uint32 value) {
+	uint8 *b = (uint8 *)ptr;
+	b[0] = (uint8)(value >> 16);
+	b[1] = (uint8)(value >>  8);
+	b[2] = (uint8)(value >>  0);
+}
+
 #ifdef SCUMM_LITTLE_ENDIAN
 #define READ_UINT24(a) READ_LE_UINT24(a)
+#define WRITE_UINT24(a,b) WRITE_LE_UINT24(a,b)
 #else
 #define READ_UINT24(a) READ_BE_UINT24(a)
+#define WRITE_UINT24(a,b) WRITE_BE_UINT24(a,b)
 #endif
 
 inline int16 READ_LE_INT16(const void *ptr) {