diff --git a/src/asm/output.c b/src/asm/output.c
index 99044900..34c6766e 100644
--- a/src/asm/output.c
+++ b/src/asm/output.c
@@ -504,7 +504,7 @@ out_WriteObject(void)
 		struct PatchSymbol *pSym;
 		struct Section *pSect;
 
-		fwrite("RGB4", 1, 4, f);
+		fwrite("RGB5", 1, 4, f);
 		fputlong(countsymbols(), f);
 		fputlong(countsections(), f);
 
diff --git a/src/link/object.c b/src/link/object.c
index 1f6a2334..1e40eb83 100644
--- a/src/link/object.c
+++ b/src/link/object.c
@@ -336,8 +336,7 @@ obj_ReadOpenFile(FILE * pObjfile, char *tzObjectfile)
 	tzHeader[4] = 0;
 	if (strncmp(tzHeader, "RGB", 3) == 0) {
 		switch (tzHeader[3]) {
-		case '3':
-		case '4': // V4 supports OAM sections, but is otherwise identical
+		case '5':
 			obj_ReadRGB(pObjfile);
 			break;
 		default: