diff --git a/src/Decoder.c b/src/Decoder.c
index 8de13f9..64b9c8e 100644
--- a/src/Decoder.c
+++ b/src/Decoder.c
@@ -320,7 +320,7 @@ static ZydisStatus ZydisInputNextBytes(ZydisDecoderContext* context,
     ZYDIS_ASSERT(instruction); 
     ZYDIS_ASSERT(value);
 
-    if (instruction->length >= ZYDIS_MAX_INSTRUCTION_LENGTH) 
+    if (instruction->length + numberOfBytes > ZYDIS_MAX_INSTRUCTION_LENGTH) 
     { 
         return ZYDIS_STATUS_INSTRUCTION_TOO_LONG; 
     }