diff --git a/MCInst.h b/MCInst.h
index 34a347dd03..bd9b760f4b 100644
--- a/MCInst.h
+++ b/MCInst.h
@@ -154,7 +154,6 @@ struct MCInst {
 	// A prefix byte gets value 0 when irrelevant.
 	// This is copied from cs_x86 struct
 	uint8_t x86_prefix[4];
-	bool x86_lock_rep;	// does this X86 insn contain LOCK/REP prefix?
 };
 
 void MCInst_Init(MCInst *inst);
diff --git a/cs.c b/cs.c
index 08cf8e3ebb..3a388e27ce 100644
--- a/cs.c
+++ b/cs.c
@@ -446,8 +446,6 @@ size_t cs_disasm_ex(csh ud, const uint8_t *buffer, size_t size, uint64_t offset,
 
 	handle->errnum = CS_ERR_OK;
 
-	memset(insn_cache, 0, sizeof(insn_cache));
-
 	// save the original offset for SKIPDATA
 	offset_org = offset;