diff --git a/pixel.cpp b/pixel.cpp
index 11fc4add23ccaf6df51bb324acb291b06bd32887..3055d6f9d8684be75451bb91cf0f9374bd9298b1 100644
--- a/pixel.cpp
+++ b/pixel.cpp
@@ -18,7 +18,7 @@ void decrypt(int data);
 void toAscii(char *c);
 
 
-void pixel(char *key;
+void pixel(char *key,
         ap_int<32> selector,
 		ap_int<32> position1,
 		ap_int<32> position2,