diff --git a/mach/con_float b/mach/con_float
index 26cf7fb6e..a43bbe9cc 100644
--- a/mach/con_float
+++ b/mach/con_float
@@ -472,7 +472,6 @@ static int been_here;
 	}
 }
 #else
-#define ACKFLOAT 1
 
 con_float() {
 	int i, j;