diff --git a/test/tests/testunity.c b/test/tests/testunity.c
index e66de4d..8ef3034 100644
--- a/test/tests/testunity.c
+++ b/test/tests/testunity.c
@@ -53,7 +53,6 @@ static const _UD d_zero = 0.0;
 void startPutcharSpy(void);
 void endPutcharSpy(void);
 char* getBufferPutcharSpy(void);
-void putcharSpy(int c);
 
 static int SetToOneToFailInTearDown;
 static int SetToOneMeanWeAlreadyCheckedThisGuy;