diff --git a/libr/asm/arch/lh5801/lh5801.h b/libr/asm/arch/lh5801/lh5801.h
index 5be3af3bda..3b99a7efc8 100644
--- a/libr/asm/arch/lh5801/lh5801.h
+++ b/libr/asm/arch/lh5801/lh5801.h
@@ -89,9 +89,8 @@ enum lh5801_insn_class {
 
 /* Instruction description. */
 struct lh5801_insn_class_desc {
-	/* Assembler mnemonic and description (for ?d) */
-	const char *mnem;
-	const char *desc;
+	char mnem[4];		/* Assembler mnemonic */
+	const char *desc;	/* Textual description (for ?d) */
 
 	/* TODO: r2 insn type? */
 };