diff --git a/src/decode/casemul.c b/src/decode/casemul.c
index 9bc2273..100dfd6 100644
--- a/src/decode/casemul.c
+++ b/src/decode/casemul.c
@@ -323,7 +323,7 @@ int g1m_decode_casemul(g1m_t *handle, g1m_buffer_t *buffer)
 	DREAD(glb, casemul_header)
 
 	/* read the source header */
-	if ((err = read_internal(buffer, MAKELONG('SR', 'CR'), VER)))
+	if ((err = read_internal(buffer, MAKELONG('SR', 'CE'), VER)))
 		return (err);
 	DREAD(src, casemul_source_header)
 	log_info("%d program(s), %d pic(s), %d matrix(es), %d list(s)",